How many terms are there in a geometric series if the first term is 3, the common ratio is 2, and the sum of the series is 93?

Hint: r ≠ 1, where a1 is the first term and r is the common ratio.

n = 3

n = 4

n = 5

n = 6

I know it's not D...could you help me please?

failurewithasmile
Apr 14, 2017