1.

Coefficient of x^(m) in the expansion of S = (1 + x)^(2m) + x(1 +·x)^(2m-1) + x^(2)(1 + x)^(2m- 2) + .... +x^(2m) is

Answer»

`""^(2M)C_(m)+""^(2m+1)C_(m-1)`
`""^(2m+1)C_(m)`
`0`
`2m^(2)+2m+1`

Answer :B


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