1 # 2 + 2 # 3 + 3 # 4 + + n1n + 12 = 1 3 n1n + 121n + 22
Chapter 9, Problem 17(choose chapter or problem)
1 # 2 + 2 # 3 + 3 # 4 + + n1n + 12 = 1 3 n1n + 121n + 22
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