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sum(r=0)^(300)ar x^r=(1+x+x^2+x^3)^(100)...

`sum_(r=0)^(300)a_r x^r=(1+x+x^2+x^3)^(100)dot` If `a=sum_(r=0)^(300)a_r ,t h e nsum_(r=0)^(300)r a_r` is equal to `300 a` b. `100 a` c. `150 a` d. `75 a`

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