1.

Let n be a positive integer and (1+x)^(n)+C_(0)+C_(1)x+C_(2)x^(2)+C_(3)x^(3)+ . . .+C_(r)x^(r)+ . . .+C_(n-1)x^(n-1)+C_(n)x^(n) Where C_(r) stands for .^(n)C_(r), then Q. The value of underset(0 le r lt s le n)(sum sum)(C_(r)+-C_(S))^(2) is

Answer»

`(N UNDERSET(+)(-)1).^(2n)C_(n)+-2^(2n)`
`(n+1).^(2n)C_(n)+2^(2n-1)`
`(n+-1).^(2n)C_(n)+-2^(2n)`
`(n+1).^(2n)C_(n)-2^(2n-1)`

Answer :A


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