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OpenStudy (anonymous):
a+a×1,15+a×(1,15)2+a×(1,15)3etc........+a(1,15)11=2900
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OpenStudy (anonymous):
how to decide a ?
OpenStudy (anonymous):
Well it is in a geometric series with common ratio 115 , first term a and there are 12 terms
OpenStudy (anonymous):
So,|dw:1349085722832:dw|
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