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|x| <1 হলে 1 + x + x² + x²+........ ধারার যোগফল কোনটি?

\frac{1}{{(1 - x)}^{2}}

\frac{1}{(1 + x) ²}

\frac{1}{1 + x}

\frac{1}{1 - x}

ANS : 4

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