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Geometrically sum?

Algebra Level 1

If $x=0,$ then $x - x^2 + x^3 - x^4 + \cdots = 0.$

Which of the following is the value of $y - y^2 + y^3 - y^4 + \cdots ,$ where $y$ is some real number?

1 2 3 4 None of these are possible

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by Pi Han Goh

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