1.

C_0^2+3.C_1^2+5. C_2^2+….+(2n+1) .C_n^2=

Answer»

`(N-2)((2N)!)/((n!)^2)`
`(n-1)((2n)!)/((n!)^2)`
`(n+2)((2n)!)/((n!)^2)`
`(n+1)((2n)!)/((n!)^2)`

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