1.

""^(2n +1)C_0^2 -""^(2n+1)C_1^2 + ""^(2n+1)C_2^2 -…….- ""^(2n+1)C_(2n+1)^2 =

Answer»

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

ANSWER :A


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