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OpenStudy (anonymous):
find S20 for the series -1+(-3)+(-5) please explain how to do it
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OpenStudy (anonymous):
20-1-3-5 o. o?
OpenStudy (anonymous):
no the 20th number in the series, sorry it should be -1+(-3)+(-5)...
geerky42 (geerky42):
So this sequence add up to 2 every time, start with one, so we have \(\Large S_n = -\sum_{k=1}^n ~ 2k-1 ~\longrightarrow ~-2\sum_{k=1}^n k +\sum_{k=1}^n1\)
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