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If S = 109 + 108/5 + 107/5^2 +..+ 2/5^107 + 1/5^108 then the

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If S = 109 + 108/5 + 107/52 +..+ 2/5107 + 1/5108 then the value of 165 - (25)-54 is

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Correct answer is 2175

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