Evaluate (1/2 - 1/4 + 1/8 - 1/16 + ...) - 1
S = a/(1-r), where a = 1/2, r = -1/2. S = 1/2 3/2 = 1/2 x 3/2 = 1/3. 1/3 - 1 = -2/3
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