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OpenStudy (anonymous):
-9, -27, -81 +... -19683 Please explain how to find the sum in the shortest way
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OpenStudy (anonymous):
Well its a geometric sequence
OpenStudy (cwrw238):
this is a geometric series whode common ration = -27 / -9 = 3 each term is found by multiplying previous one by 3
OpenStudy (anonymous):
so use this formula to find the sum. |dw:1339347117905:dw|
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