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rocksquad7917
22.07.2019 •
Mathematics
Find the sum of the geometric sequence −3, 15, −75, 375, when there are 7 terms and select the correct answer below. −39,063 39,063 58,593 −58,593
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Ответ:
ANSWER
−39,063
EXPLANATION
The given geometric sequence is
-3,15,-75,375,...
The sum of the first n-terms of a geometric sequence is calculated using the formula;
Where a=-3 is the first term of the geometric sequence and
is the common ratio of the sequence.
The sum of the first seven terms is
This simplifies to:
Ответ:
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