Prove that 12 ? 22 + 32 + (?1)n-1 n2 = (?1)n -1n(n + l)/2
Chapter 5, Problem 13E(choose chapter or problem)
Problem 13E
Prove that 12 − 22 + 32 + (−1)n-1 n2 = (−1)n -1n(n + l)/2 whenever n is a positive integer.
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