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24 September, 07:09

Find the sum of the first twenty terms of an arithmetic progression

16+9+2 + (-5) + ...

+1
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  1. 24 September, 10:31
    0
    16 + (16-7) + (16-2*7) + (16-3*7) + ... + (16-19*7) =

    20*16-7 (1+2 + ... + 19) = 20*16-7*19*20:2=320 - 1330 = - 1010
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