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Which series has a sum of 20?

Which series has a sum of 20?-example-1
User Vszholobov
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2 Answers

5 votes

Answer:

The answer is A) 5(3/4)^n-1.

Explanation:

User UmarKashmiri
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8.9k points
6 votes

Answer:

see below

Explanation:

The sum of an infinite series with first term "a" and common ratio "r" is ...

S = a/(1 -r) . . . . . for |r| < 1

Then the sums for the given answer choices are ...

A: 5/(1 -3/4) = 20 . . . . . the answer of choice

B: 4/(1 -5/6) = 24

C: 4/(1 -1/5) = 5

D: 10/(1 -1/5) = 12.5

Which series has a sum of 20?-example-1
User Khael
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