Question: Problem 2. Find a closed form expression of x for the sumn=0n2zn=12x+22x2+32x3+42x4+cdotsfor ??rnr-1.Hint: Start with with ??rn, diflerentiate, multiply with r, differentiste.

Problem 2. Find a closed form expression of x for the sumn=0n2zn=12x+22x2+32x3+42x4+cdotsfor ??rnr-1.Hint: Start with with ??rn, diflerentiate, multiply with r, differentiste.

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