If (1-x)^(-n)=a0+a1x+a2x^2++ar x^r+ ,t h...

If `(1-x)^(-n)=a_0+a_1x+a_2x^2++a_r x^r+ ,t h e na_0+a_1+a_2++a_r` is equal to (a)`(n(n+1)(n+2)(n+r))/(r !)` (b)`((n+1)(n+2)(n+r))/(r !)` (c)`(n(n+1)(n+2)(n+r-1))/(r !)` (d)none of these

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