Answers

2016-07-09T21:25:40+08:00
A) Plug the given in the formula
31250 = 2(5^n-1)
15625 = 5^n-1
Express 15625 as a power of 5
5^6 = 5^n-1
6 = n - 1
n = 7
7 terms

b) 16807 = 1/7(7^n-1)
117649 = 7^n-1
7^6 = 7^n-1
6 = n - 1
n = 7
7 terms
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