\( y=x-x^2+x^3-x^4+.... \) হলে \( (1+x)= \) কত?

A \( (1+y)^{-1} \)

B \( (1-y)^{-1} \)

C \( (1+y)^{-2} \)

D \( (1-y)^{-2} \)

Solution

Correct Answer: Option B

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