If x-1-y-y2- then the value of y is

Given, x=1+y+y^2+.....∞ or, x=11 y for |y| 1 or, 1 y=1x or, y=xx 1 . ...

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Sum of Infinite Terms of a GP

If x=1+y+y2...

Question

If $x = 1 + y + y^{2} + . . . . . . . \infty$ then the value of $y$ is

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