SOLUTION: What is the sum of the infinite geometric series with a1 = 27 and r = -4/5?

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Question 3950: What is the sum of the infinite geometric series with a1 = 27 and r = -4/5?
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
S to infinity = a%2F%281-r%29 where |r|<1

so, here we get Sum = 27%2F%281-%28-4%2F5%29%29
Sum = 27%2F%281%2B4%2F5%29
Sum = 27%2F%289%2F5%29
Sum = 15

jon.