If x + y = 1, prove that underset(r=0)ov...

If `x + y = 1`, prove that `underset(r=0)overset(n)sum r.^(n)C_(r) x^(r ) y^(n-r) = nx`.

A

nxy

B

nx(x+yn)

C

n(nx+y)

D

1

Text Solution

Verified by Experts

The correct Answer is:

C

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