SOLUTION: A geometric sequence has a1 = 16 and r = \sqrt{2}2, what is the sum of the first 21 terms?

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Question 872386: A geometric sequence has a1 = 16 and r = \sqrt{2}2, what is the sum of the first 21 terms?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
What is "r = \sqrt{2}2," ?