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11-03-2016
Mathematics

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find the sum of the geometric series -3,15,-75,375 when there are 9 terms and select the correct answer below

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Аноним Аноним

11-03-2016

The sum to nterms:

Sn=a(r^n - 1) / (r-1)

r=15/-3=-5
a=-3

Sn=-3(-5⁹ - 1) / (-5-1)=-976563

Answer; -976563

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