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If x + y = 1, then sum(r-0)^n r nCr x^...

If `x + y = 1`, then `sum_(r-0)^n r nC_r x^r y^(n-r)` equals

A

1

B

n

C

nx

D

ny

Text Solution

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The correct Answer is:
C
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FIITJEE-MATHEMATICS TIPS-ASSIGNMENT (SECTION (I) : MCQ (SINGLE CORRECT)
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