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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

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

asked
User Natario
by
7.4k points

1 Answer

3 votes
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
answered
User Tammye
by
8.3k points
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