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21 August, 13:09

Which of the following terms appear in the expansion of (x + y) 10? The letter a in each term represents a real constant.

A. ax3y7

B. ax6y4

C. ax5

D. ax4y6

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Answers (1)
  1. 21 August, 13:38
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    The answer is D. ax4y6

    proof

    the binome of newton is S a x^k y^n-k = (x+y) ^n, for k=0 ... n

    for n=10, it is a y^10 + ... + a x4 y^10-4 + ... + ax^10
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