Monday, 16 July 2018

Find the number of terms in the geometric series, given the first and the third term and the sum

In a geometric series, the first term is 12, the third term is 92, and the sum of all of the terms of the series is 62813. How many terms are in the series?



According to the answer sheet of the pre-calculus 11 book, the number terms in the series is 13. Can anyone explain how does that happen?

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