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If x+y=1, then sum(r=0)^(n)r^(2)""^(n)C(...

If `x+y=1`, then `sum_(r=0)^(n)r^(2)""^(n)C_(r)x^(r)y^(n-r)` equals:

A

nxy

B

nx(n+ny)

C

nx(nx+y)

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
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