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If (x^2+x+1)/(1-x)=a0+a1x+a2x^2+ ,t h e ...

If `(x^2+x+1)/(1-x)=a_0+a_1x+a_2x^2+ ,t h e nsum_(r=1)^(50)a_r` is equal to `148` b. `146` c. `149` d. none of these

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