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If (1+x+x^2+x^3)^n=sum(r=0)^300 brx^r an...

If `(1+x+x^2+x^3)^n=sum_(r=0)^300 b_rx^r and k=sum _(r=0)^300 b_r=k, then sum_(r=0)^300 r. b_r, ` is (A) `50.4^100` (B) `150.4^100` (C) `300.4^100` (D) none of these

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