SOLUTION: The sum of an infinite geometric series is 108, while the sum of the first 3 terms is 112. Determine the first term of this series.
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Question 1186218: The sum of an infinite geometric series is 108, while the sum of the first 3 terms is 112. Determine the first term of this series.
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!
Let the first term be a and the common ratio be r.
(1) The infinite sum is
The sum of the first three terms is
ANSWER: The first term is a = 144.
CHECK:
infinite sum:
sum of first three terms:
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