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|X| < 1

1 + x + x^{2} + x^{3} + . . . . .

ধারাটির যোগফল কোনটি?

\frac{1}{1 - x}

\frac{1}{1 + x}

{(1 - x)}^{2}

{(1 + x)}^{- 2}

ANS : 1

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