Question: W2. Suppose an unknown series has the partial sums below. In each case, (i) find an explicit form an for the sequence being summed, and

W2. Suppose an unknown series has the partial sums below. In each case, (i) find an explicit form an for the sequence being summed, and (ii) either find the sum of the series or show that it diverges.(a)sk=k(k1)2(b)sk=k-1k1

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