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\frac{1}{4} - \frac{1}{6} + \frac{1}{9} - \frac{2}{7} + . . . . . . .

S_{\infty} = \frac{20}{3}

S_{\infty} = \frac{3}{20}

S_{\infty} = 20

S_{\infty} = 3

ANS : 2

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