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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(x+ yn)`

C

`nx(nx+ y)`

D

None of these

Text Solution

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The correct Answer is:
C
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