The coefficient of x^m in (1+x)^m +(1+m)...

The coefficient of `x^m` in `(1+x)^m +(1+m)^(m+1) +...+(1+x)^n ,m≤n` is

`""^(n+1)C_(m +1)`

`""^(n-1)C_(m-1)`

`""^(n)C_(m)`

`""^(n)C_(m +1)`

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OBJECTIVE RD SHARMA ENGLISH-BINOMIAL THEOREM AND ITS APPLCIATIONS -Exercise

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