cmcaesar12 cmcaesar12

19-06-2017
Mathematics

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

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crisforp crisforp

19-06-2017

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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