a. Evaluate: (sum_{k=1}^{3}left(k^{2}-2 k+1ight) ) b. Expand: (sum_{k=1}^{4} frac{k-1}{k+1})

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a. Evaluate: \(\sum_{k=1}^{3}\left(k^{2}-2 k+1ight) \)

b. Expand: \(\sum_{k=1}^{4} \frac{k-1}{k+1}\)

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