stephaniedagoy stephaniedagoy

20-02-2018
Mathematics

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

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mathmate mathmate

20-02-2018

S1=-1
S2=-4
S3=-9
S4=-16
....
Sn=-n^2
...
S20=-20^2=-400

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