SOLUTION: Please Help: Find the sum of the first five terms of the geometric sequence. a = 1, r = 2 A) 31/5 B) 91/3 C) 31 D) 91/15

Question 201898: Please Help:
Find the sum of the first five terms of the geometric sequence.
a = 1, r = 2
A) 31/5
B) 91/3
C) 31
D) 91/15

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
The formula for the sum of the first "n" terms of any geometric sequence is

Start with the given formula

Plug in , , and

Raise 2 to the 5th power to get 32

Subtract

Multiply

Divide

So the sum of the first five terms is 31 which means that the answer is C)
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