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If (1+x+x^2+x^3)^n=sum(r=0)^(3n)br x^r ...

If `(1+x+x^2+x^3)^n=sum_(r=0)^(3n)b_r x^r and sum_(r=0)^(3n)b_r=k ,"t h e n"sum_(r=0)^(3n)r b_r` is

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