Find the sum of the following infinite geometric series if it exists 1/2 + -1/4 + 1/8 + -1/16

Find the sum of the following infinite geometric series if it exists 1/2 + -1/4 + 1/8 + -1/16

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We have x/y^2 .
OK ?!

But in each 2th we have (-) too !

I know the common ratio is -1/2

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