Find the sum of the geometric series...

[From: ] [author: ] [Date: 11-06-08] [Hit: ]

S_16 = 86,093,......

First term is 4, common ratio is 3, 16 total terms. What is the sum?
Thanks!

S_n = a_1[(1-r^n)/(1-r)]

S_16 = 4[(1-3^16)/(1-3)]

S_16 = 86,093,440

:)

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