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নিচের কোন ধারাটির অসীমতক সমষ্টি আছে।

\frac{1}{3} - \frac{4}{9} + \frac{16}{27} - \frac{64}{81} + . . . .

\frac{1}{4} - \frac{5}{16} + \frac{25}{64} - \frac{125}{256} + . . . .

\frac{3}{4} - \frac{9}{16} + \frac{27}{64} - \frac{81}{256} + . . . .

\frac{1}{2} - \frac{3}{4} + \frac{9}{8} - \frac{27}{16} + . . . .

ANS : 3

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