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20 June, 15:59

Find s20 for the series - 1 + - 3 + - 5 + - 7 + ...

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  1. 20 June, 19:01
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    S1=-1

    S2=-4

    S3=-9

    S4=-16

    ...

    Sn=-n^2

    ...

    S20=-20^2=-400
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