1.

If n is odd then C_0^2 - C_1^2+C_2^2-…....+(-1)^nC_n^2=

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0
`""^n C_((n//2))(-1)^(n//2)`
`""^(2N) C_n (-1)^n`
`""^((2n+1)) C_n (-1)^n`

ANSWER :A


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