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OpenStudy (anonymous):
Find S20 for the series -1 + -3 + -5 + -7 +... help?
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OpenStudy (loser66):
You have formula for this, what is it? Notice: S means sum
OpenStudy (anonymous):
s=-1-2n
OpenStudy (loser66):
I don't get. Use draw button to jot it down, please
OpenStudy (anonymous):
|dw:1439655417621:dw|
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