Evidence presented, in the light most favorable to the State, tended to show the following:
Van Burén Luther, age 71, was discovered lying on the floor of Luther’s Grocery Store at 1:37 p.m. on 20 July 1984. The rescue squad arrived within minutes, by which time Mr. Luther was *230walking carefully out of the door of the store, holding his head. He was covered with blood, but was no longer bleeding. An ambulance arrived at 2:09 p.m. and took him, intermittently unconscious and restless, to the hospital, where he died at 5:53 p.m.
Defendant was taken into custody and advised of his rights at around 4:30 p.m. the same day. At 7:00 p.m. defendant made a statement to an SBI agent confessing that he had inflicted blows to the victim’s head with a hammer.
The jury found defendant guilty of robbery with a dangerous weapon and murder in the first degree on the bases of both felony murder and malice, premeditation, and deliberation. See N.C.G.S. 14-17 (1986). The jury found that mitigating circumstances were insufficient to outweigh aggravating circumstances and recommended a sentence of death.
Guilt Phase
[1] Defendant raises six issues concerning the guilt-innocence phase of the trial. In three of these defendant contends that the trial court erred in failing to dismiss the charge of first degree murder because the evidence was insufficient to prove (1) a specific intent to kill, (2) premeditation and deliberation, and (3) that defendant proximately caused the victim’s death. This Court has observed that while specific intent to kill is an essential element of first degree murder, it is also a necessary constituent of the elements of premeditation and deliberation. State v. Propst, 274 N.C. 62, 71, 161 S.E. 2d 560, 567 (1968). “Thus, proof of premeditation and deliberation is also proof of intent to kill.” State v. Jones, 303 N.C. 500, 505, 279 S.E. 2d 835, 839 (1981). We therefore treat these contentions together.
Premeditation has been defined as “thought beforehand for some length of time, however short.” State v. Welch, 316 N.C. 578, 589, 342 S.E. 2d 789, 796 (1986) (quoting State v. Corn, 303 N.C. 293, 297, 278 S.E. 2d 221, 223 (1981)). A killing is committed with deliberation if it is done in a “ ‘cool state of blood,’ without legal provocation, and ... to accomplish some unlawful purpose. (Citation omitted.) The intent to kill must arise from ‘a fixed determination previously formed after weighing the matter.’ ” Id. at 589-590, 342 S.E. 2d at 796 (quoting State v. Corn, 303 N.C. 293, 297, 278 S.E. 2d 221, 223).
*231Because premeditation and deliberation relate to mental processes, they are rarely susceptible to proof by direct evidence. State v. Gladden, 315 N.C. 398, 430, 340 S.E. 2d 673, 693, cert. denied, --- U.S. ---, 93 L.Ed. 2d 166 (1986). This Court has identified a number of circumstances that may be considered in determining whether a killing was with premeditation and deliberation. Among these are (1) a lack of provocation on the part of the deceased, (2) the conduct and statements of the defendant before and after the killing, (3) the dealing of lethal blows after the deceased has been felled and rendered helpless, (4) evidence that the killing was done in a brutal manner, and (5) the nature and number of the victim’s wounds. E.g., State v. Gladden, 315 N.C. at 430-31, 340 S.E. 2d at 693.
In this case there was both direct and circumstantial evidence before the trial court from which the jury could find the presence of premeditation and deliberation. Direct evidence consisted of defendant’s statement, which indicated that defendant had left work around 1:00 p.m., had gone to his truck and smoked marijuana, then had driven to Luther’s Grocery on his way home. Defendant said that he stopped to get a drink, but noticed there was no one else around.
While sitting in the truck, I started thinking about how broke I was and the baby needing diapers and other things. I saw a hammer laying in the floorboard of the truck. I reached down and put the hammer in my back pocket. I went into the store and got me a Pepsi Cola and told the man I wanted a pack of cigarettes. The old man who was running the store turned to get the cigarettes. When the old man turned to get the cigarettes, I took the hammer from my pocket and hit him in the back of the head. The man fell on the floor. I hit the man one more time in the head. I got the money out from under a box in the back of the cash register. The money was in a zip-up purse. I took the money and the hammer and ran out to the truck and got in it.
Defendant’s statement concluded by describing how he had thrown the hammer out of the truck window, hidden the money under a rock in a field, and returned to work some time after 2:00 p.m.
*232The statement alone reveals defendant’s emotional state just prior to the attack. He had been reflecting on his inability to provide for his family when he was inspired to pick up a hammer lying on the floor of the truck. He pocketed it, entered the store, fetched a soft drink, then approached the victim, asked for cigarettes, and hit the victim over the head while his back was turned. The jury could reasonably have concluded that these actions resulted from deliberation — that they were not impulsive but governed by cool, reasoned thought.
Jason Coggins, defendant’s co-worker, testified that defendant had left work around 1:30 p.m. because he said he had something he needed to do. When defendant returned approximately a half an hour later, Coggins noticed nothing unusual about defendant’s conduct or demeanor. Coggins’ testimony describing defendant’s absence of agitation, along with defendant’s deliberate disposal of the bloodied hammer and the money, similarly support the jury’s finding of the deliberation element of murder in the first degree.
In addition, defendant’s statement reveals the unprovoked and brutal nature of the assault upon the shopkeeper. Defendant confessed that he inflicted a second blow to the victim’s head after the victim had already been knocked to the floor. If, as defendant contends, the first blow was the result of a premeditated and deliberate decision only to rob but not to kill, then the second blow provided sufficient evidence for the jury to find these essential elements for first degree murder. The brutality of the attack was also apparent from the testimony of the forensic pathologist who conducted an autopsy on the victim. He described the injuries to the victim’s head as ten distinct lacerations, “the majority” of which reached to the skull. In his opinion these wounds had been caused by more than one blow of a blunt object.
For his contention that the evidence was insufficient to prove that his hammer blows proximately caused the victim’s death, defendant relies upon the testimony of a hospital physician who arrived in the emergency room five to ten minutes before the official time of the victim’s death and while cardio-pulmonary resuscitation was in progress. The physician initially determined that the probable cause of the victim’s death was myocardial infarction. However, in his testimony the physician stressed that this *233conclusion was a first impression and that it was not borne out by the autopsy.
The forensic pathologist who performed the autopsy testified that the victim had had severe heart disease, including severe occlusion of two of his three main coronary arteries. He noted an area of fibrosis, indicating that the victim had suffered a heart attack in the past, but he testified unequivocally that in his opinion the victim’s death had been caused by blunt-force injuries to the head. If the victim had had a heart attack “at the last minute,” the pathologist testified, the injuries to the head and the ensuing trauma had caused that attack.
A person is criminally responsible for a homicide if his act caused or directly contributed to the death of the victim. State v. Brock, 305 N.C. 532, 539, 290 S.E. 2d 566, 571 (1982); State v. Atkinson, 298 N.C. 673, 682, 259 S.E. 2d 858, 864 (1979), overruled in part on other grounds, State v. Jackson, 302 N.C. 101, 273 S.E. 2d 666 (1981). The testimony of the pathologist was definitive on the issue of proximate cause. The cause of death tentatively cited by the emergency room physician was, according to the physician’s own testimony, not medically conclusive. Even if the jury had perceived that testimony as contradicting the findings of the forensic pathologist, such contradictions and discrepancies are for the jury to resolve and do not warrant dismissal. State v. Brown, 315 N.C. 40, 58, 337 S.E. 2d 808, 822 (1985), cert. denied, — U.S. ---,90 L.Ed. 2d 733 (1986); State v. Powell, 299 N.C. 95, 99, 261 S.E. 2d 114, 117 (1980).
In considering a motion to dismiss, the trial court must view all of the evidence in the light most favorable to the State, and the State is entitled to every reasonable inference that may be drawn therefrom supporting the charges against the defendant. State v. Penley, 318 N.C. 30, 48, 347 S.E. 2d 783, 793 (1986). “The trial court must determine as a matter of law whether the State has offered ‘substantial evidence of all elements of the offense charged so any rational trier of fact could find beyond a reasonable doubt that the defendant committed the offense.’ ” Id., 347 S.E. 2d at 794 (quoting State v. Riddick, 315 N.C. 749, 759, 340 S.E. 2d 55, 61 (1986)). If the trial court determines that “there is substantial evidence (a) of each essential element of the offense charged, . . . and (b) of defendant’s being the perpetrator of the *234offense,” then the motion to dismiss is properly denied. Id., 347 S.E. 2d at 793.
We conclude that there was substantial evidence before the jury that the victim’s death was the proximate result of hammer blows to his head inflicted by defendant after premeditation and deliberation and with the specific intent to kill. The trial court thus did not err in denying defendant’s motion to dismiss the charge of first degree murder on that basis.
[2] Defendant next contends that the trial court committed plain error by including the following statement in its instructions to the jury: “Now, the evidence for the State does tend to show that . . . Mr. Luther was struck a total of some ten times and sustained ten injuries to his head.” Defendant notes that the only source of evidence at trial concerning how many times the victim was struck with the hammer was defendant’s statement, which specifically described only two blows. Although the pathologist testified that in his opinion the victim’s injuries were so separate that one blow could not have caused them all, he offered no opinion as to how many blows had caused the ten wounds, nor what object(s) had dealt the blows.
Strictly speaking, the trial court’s statement was factually accurate, if arguably misleading. The pathologist’s testimony that the victim’s head had ten lacerations did not necessarily imply that defendant had struck all ten blows. It was possible, for instance, that the victim cut his head on the counter or floor when he first fell. Similarly, the trial court’s instruction that the victim had been “struck” ten times did not necessarily imply that defendant’s hammer had done the striking. Even if this was the jury’s understanding, any inaccuracy was cured by prior and subsequent instructions and rulings. First, the trial court told the jury more than once to use its own recollection of the evidence rather than the court’s summary. Second, the court accurately recapitulated defendant’s statement that he had hit the victim only twice. Third, the jury was permitted to review defendant’s statement during its deliberations. When, as here, the defendant fails to object to the alleged error at trial, the appellate court must be convinced that had the error been absent, the jury probably would have reached a different verdict. State v. Stanton, 319 N.C. 180, 188-89, 353 S.E. 2d 385, 390-91 (1987). See State v. Black, *235308 N.C. 736, 740-41, 303 S.E. 2d 804, 806-07 (1983). We are convinced that the trial court’s misstatement, if indeed it was one, was of no substantial consequence. See State v. Jones, 303 N.C. at 506-07, 279 S.E. 2d at 839.
[3] Defendant also assigns error to the trial court’s treatment of challenges for cause of two potential jurors. One of these expressed his belief that every murderer should receive the death sentence; but upon assuring the trial court that he could and would follow the court’s instructions and remain open-minded regarding the appropriate sentence, he was seated as a juror. The other potential juror expressed his uncertainty about whether he could impose the death penalty, even if he were instructed to do so by the court.
We note preliminarily that defendant exercised only six of the fourteen peremptory challenges permitted him under N.C.G.S. 15A-1217(a)(l). Because he did not exhaust his peremptory challenges as provided by N.C.G.S. 15A-1214(h), no prejudice has been shown as to the juror who remained on the panel. State v. Avery, 315 N.C. 1, 21, 337 S.E. 2d 786, 797 (1985).
The constitutional standard for determining when a prospective juror may be excluded for cause because of his or her views on capital punishment is “whether the juror’s views would ‘prevent or substantially impair the performance of his duties as a juror in accordance with his instructions and his oath.’ ” Wainwright v. Witt, 469 U.S. 412, 424, 83 L.Ed. 2d 841, 851-52 (1985) (quoting Adams v. Texas, 448 U.S. 38, 45, 65 L.Ed. 2d 581, 589 (1980)). Both potential jurors were asked if they could put aside their prejudices concerning the death penalty and respond to the court’s instructions. One juror said he could; the other responded equivocally. Under the Adams-Witt standard, the first was properly not excused for cause; the second was properly so excused. The trial court has “broad discretion ‘to see that a competent, fair and impartial jury is empaneled.’ ” State v. Avery, 315 N.C. 1, 21, 337 S.E. 2d 786, 797 (quoting State v. Johnson, 298 N.C. 355, 362, 259 S.E. 2d 752, 757 (1979)). We find no abuse of that discretion here.
[4] In defendant’s final assignment of error concerning the guilt phase of his trial, he complains that the prosecutor’s closing argu*236ment was based upon facts not in evidence. The prosecutor argued in part:
That at the store [defendant] thought of killing Mr. Luther, thought of robbing him there. I would argue that that was premeditation. . . . That the Defendant acted after premeditation, that he formed the intent to kill. Once again, in his own words, he thought of killing him before he went into the store.
“[I]n his own words” could refer only to defendant’s statement, defendant avers, since he did not testify at the guilt phase of his trial. The statement contains no admission that he had killing the shopkeeper in mind before he entered the store.
Even if the jury had understood this portion of the prosecutor’s argument to be a statement of fact and not argument, defendant was not prejudiced thereby. The jury had heard the statement read to it during presentation of the State’s case, it heard — more than once — the trial court’s charge that it was to take its own recollection of the evidence, and it had the text of defendant’s statement in the jury room throughout its deliberations. We note defendant’s failure to object when the prosecutor made these remarks, and hold that “in the absence of [that] objection, the statement did not amount to such gross impropriety as to require the trial judge to act ex mero motu, or to recall that the statement had been made and caution the jury to disregard it.” State v. Oliver, 309 N.C. 326, 359, 307 S.E. 2d 304, 325-26 (1983).
Sentencing phase
[5] The only aggravating circumstances submitted to and found by the jury in the sentencing phase of the trial were that the murder was committed while defendant was engaged in the commission of a robbery, N.C.G.S. 15A-2000(e)(5), and that the murder was committed for pecuniary gain, N.C.G.S. 15A-2000(e)(6). Defendant contends that submitting both factors violates due process and renders the capital sentence arbitrary and capricious. Under the particular facts of this case, we find defendant’s contention that it was error to submit both factors meritorious.
The jury found defendant guilty of murder in the first degree based specifically upon both felony murder and premeditation and *237deliberation. The basis for the conviction dictates differences in sentencing. Most notable among these is the application of the merger rule to a felony murder: when a murder is committed in the course of a felony and the perpetrator is convicted of murder in the first degree solely on that basis, “the underlying felony becomes a part of the murder charge to the extent of preventing a further prosecution of the defendant for, or a further sentence of the defendant for, commission of the underlying felony.” State v. Cherry, 298 N.C. 86, 113, 257 S.E. 2d 551, 567 (1979), cert. denied, 446 U.S. 941, 64 L.Ed. 2d 796 (1980); State v. Silhan, 302 N.C. 223, 262, 275 S.E. 2d 450, 477 (1981). It follows logically that the underlying felony should not be submitted as an aggravating circumstance at the sentencing phase of the trial. In State v. Cherry, this Court observed that a defendant convicted of a felony murder “will have one aggravating circumstance ‘pending’ ” simply by virtue of the nature of the underlying felony. Cherry, 298 N.C. at 112, 275 S.E. 2d at 568. Because this “flaw in the statute” would result in the greater possibility that a felony-murder defendant would be sentenced to death than one convicted on the basis of premeditation and deliberation, we held that aggravating circumstances “concerning the underlying felony” could not be submitted as aggravating factors in sentencing. Id. at 113, 275 S.E. 2d at 568.
In State v. Oliver, 302 N.C. 28, 274 S.E. 2d 183 (1981), the Cherry holding was refined for cases in which the aggravating circumstance “for pecuniary gain” was submitted to a jury sentencing a defendant convicted of a robbery-felony-murder. The Court asserted constitutional grounds for its refinement of Cherry, holding that the fifth amendment’s protection against double jeopardy is not violated because the “pecuniary gain” aggravating factor was not an element of the underlying offense. “This circumstance examines the motive of the defendant rather than his acts. While his motive does not constitute an element of the offense, it is appropriate for it to be considered on the question of his sentence.” Id. at 62, 274 S.E. 2d at 204 (emphases added).
The rationale articulated in Oliver for submitting the “pecuniary gain” aggravating factor for purposes of sentencing robber-murders has been consistently upheld in the context of a defendant’s conviction of felony murder. E.g., State v. Jackson, *238309 N.C. 26, 44, 305 S.E. 2d 703, 716 (1983); State v. Taylor, 304 N.C. 249, 288-89, 283 S.E. 2d 761, 785 (1981), cert. denied, 463 U.S. 1213, 77 L.Ed. 2d 1398, reh’g denied, 463 U.S. 1249, 77 L.Ed. 2d 1456 (1983); State v. Irwin, 304 N.C. 93, 107, 282 S.E. 2d 439, 448 (1981). See also State v. Williams, 317 N.C. 474, 483-86, 346 S.E. 2d 405, 411-13 (1986) (in senteaicing defendant convicted under robbery-felony-murder theory, use of pecuniary gain aggravating factor does not violate eighth amendment’s proscription against cruel and unusual punishment); State v. Oliver, 309 N.C. at 351, 307 S.E. 2d at 321 (pecuniary gain factor not unconstitutionally vague). This authority clearly governs defendant’s contention here insofar as it rests upon the felony murder basis for his conviction. The aggravating factor that the murder was committed in the course of a robbery drops out under the authority of Cherry and the pecuniary gain aggravating factor remains under the authority of Oliver I and its progeny.
To this point our case law has addressed the theoretical incompatibility of these two factors only in the context of felony murders. In that context, Cherry has permitted only the pecuniary gain factor actually to be submitted to the jury. Thus, if defendant’s conviction had been based solely on felony murder, it would have been error to submit the aggravating circumstance that the murder was committed while defendant was engaged in the commission of a robbery. Cherry, 298 N.C. 86, 257 S.E. 2d 551.
The new question now before us —one of first impression in our jurisdiction — is whether these two factors, when submitted together for purposes of sentencing a defendant convicted of first degree murder on the basis of premeditation and deliberation, are redundant. We conclude that one plainly comprises the other. Although the pecuniary gain factor addresses motive specifically, the other cannot be perceived as conduct alone, for under the facts of this case the motive of pecuniary gain provided the impetus for the robbery itself. Admittedly, situations are conceivable in which an armed robber murders motivated by some impulse other than pecuniary gain, e.g., where the robbery is committed to obtain something of purely reputational or sentimental, rather than pecuniary, value. The facts of this case, though, reveal that defendant murdered the shopkeeper for the single purpose of pecuniary gain by means of committing an armed robbery.
*239Not only is it illogical to divorce the motive from the act under the facts of this case, but the same evidence underlies proof of both factors. In State v. Goodman, 298 N.C. 1, 257 S.E. 2d 569 (1979), this Court held it improper to submit two aggravating factors supported by the same evidence when a defendant has been convicted of murder in the first degree on the basis of both felony murder and premeditation and deliberation. In Goodman, the aggravating circumstance that the “capital felony was committed to disrupt or hinder the lawful exercise of any governmental function or the enforcement of laws,” N.C.G.S. 15A-2000(e)(7), was supported by the same facts as those supporting the aggravating circumstances that the “capital felony was committed for the purpose of avoiding or preventing a lawful arrest or effecting an escape from custody.” N.C.G.S. 15A-2000(e)(4). The Court wrote: “We think the submission of the two issues on the same evidence was improper. This amounted to an unnecessary duplication of the circumstances enumerated in the statute, resulting in an automatic cumulation of aggravating circumstances against the defendant.” Goodman, 298 N.C. at 29, 257 S.E. 2d at 587.
Goodman is sound general authority that in the context of a robbery-murder it is neither appropriate nor equitable to submit a statutorily-enumerated aggravating factor that overlaps with another. It is apparent that, in the particular context of a premeditated and deliberate robbery-murder where evidence is presented that the robbery was attempted or effectuated for pecuniary gain, the submission of both the aggravating factors enumerated at N.C.G.S. 15A-2000(e)(5) and (6) is redundant and that one should be regarded as surplusage. We therefore hold that it was error to submit both of these aggravating factors to the jury.-
Under the statutory sentencing scheme of Florida, the Supreme Court of that state came to the same conclusion:
[H]ere, as in all robbery-murders, both subsections refer to the same aspect of the defendant’s crime. Consequently, one who commits a capital crime in the course of a robbery will always begin with two aggravating circumstances against him while those who commit such a crime in the course of any other enumerated felony will not be similarly disadvantaged. . . . [W]e believe that [defendant’s] pecuniary motive *240at the time of the murder constitutes only one factor which we must consider in this case.
Provence v. State, 337 So. 2d 783, 786 (Fla. 1976), cert. denied, 431 U.S. 969, 53 L.Ed. 2d 1065 (1977). See also Cook v. State, 369 So. 2d 1251, 1256 (Ala. 1978) (“[W]e do not think it appropriate to apply this aggravating circumstance [pecuniary gain] to situations already condemned under subsection 4 [committed in the course of a robbery] which by definition involve an attempt at pecuniary gain. Thus, to avoid repetition, subsection 6 [pecuniary gain] should not be applied to a robbery.”).1
When there is “a reasonable possibility that the erroneous submission of an aggravating circumstance tipped the scales in favor of the jury finding that the aggravating circumstances were ‘sufficiently substantial’ to justify imposition of the death penalty,” the test for prejudicial error has been met. State v. Irwin, 304 N.C. at 107, 282 S.E. 2d at 449. Because the jury arrived at a sentence of death based upon weighing only two aggravating factors against several mitigating factors and because it is impossible now to determine the amount of weight ascribed to each factor, we cannot hold the error of submitting both redundant aggravating factors harmless. Defendant is accordingly entitled to a new sentencing hearing pursuant to N.C.G.S. 15A-2000(d)(3).
The need to address defendant’s remaining assignments of error concerning the sentencing phase of his trial is obviated by our order for a new hearing on sentencing.
*241Guilt phase: no error.
Sentencing phase: new hearing.