SOLUTION: The first three terms of a geometric progression are 4,2 and 1 the common ratio is 2. I need to calculate the sum to infinity of its terms? Can someone explain step by step how

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Question 1027238: The first three terms of a geometric progression are 4,2 and 1 the common ratio is 2.
I need to calculate the sum to infinity of its terms?
Can someone explain step by step how to get the answer please, I would greatly appreciate it.
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Recall the formula for an infinite geometric series:

if

Here, a = 4 and r = 1/2 (not 2!). Plug that in and you will get 8 as the sum.