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31 May, 01:40

What is the sum of the first five terms in the series 7+12+17 + ... ?

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  1. 31 May, 01:51
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    7 + 12 + 17 + 22 + 27 = (7 + 27) + (12 + 22) + (34 / 2) = (34 / 1) + (34 / 1) + (34 / 2) = (68 / 2) + (68 / 2) + (34 / 2) = 170 / 2 = 85.
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