1 3 + _1 3 2 + _1 3 3 + + _1 3 n = _1 2(1 - _1 3 n)
Chapter 11, Problem 22(choose chapter or problem)
1 3 + _1 3 2 + _1 3 3 + + _1 3 n = _1 2(1 - _1 3 n)
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