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What is the sum of the first five terms of a geometric series with a1 = 10 and r = 1/5?
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What is the sum of the first five terms of a geometric series with a1 = 10 and r = 1/5?

User Andrew McGivery
by
7.8k points

2 Answers

3 votes
The formula to use is:

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

S_(5) =(10(1-0.2^(5)))/(1-0.2)=12.496
The answer is 12.496
User Ajitesh
by
7.1k points
2 votes

Answer:

1562/125

Explanation:

in improper fraction form

User So Cal Cheesehead
by
8.3k points
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