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2 March, 10:03

What is the sum of the first 8 terms where an=-n+18?

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  1. 2 March, 15:18
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    We have a1 = 17; a2 = 16; a3 = 15; a4 = 14; a5 = 13; a6 = 12; a7 = 11; a8 = 10;

    We have, a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 = 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 = 108;
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