For Sn = 3^(2n - 1) + b; Find the Quotient a9 / a7

Problem
The sum of the first n terms of a series is 3^(2n - 1) + b. What is the quotient of the 9th and the 7th term?

A.   81 C.   83
B.   82 D.   84

Answer Key

Solution

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