SOLUTION: Find the sum of -16 + 4 - 1 + ... Does not exist 64/5 -64/5 64

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Question 1035612: Find the sum of -16 + 4 - 1 + ...
Does not exist
64/5
-64/5
64
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of an infinite geometric series is found by
S%5Bn%5D+=+a%5B1%5D%2F%281-r%29
Here r = -1/4
S%5Bn%5D+=+%28-16%29%2F%281+-+%28-1%2F4%29%29+=+%28-16%29%2F%285%2F4%29+=+-64%2F5