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JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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The value of log⁡2+2(15+13⋅153+15⋅155+…+∞)\log 2 + 2\left( {\frac{1}{5} + \frac{1}{3} \cdot \frac{1}{{{5^3}}} + \frac{1}{5} \cdot \frac{1}{{{5^5}}} + \ldots + \infty } \right) is
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Correct option: D
log  3\mathrm{log\;}3
Option D (log  3\mathrm{log\;}3) is correct because the expression simplifies to log⁡3\log 3 after using the logarithmic identity log⁡(1+x1−x)=2(x+x33+x55−…)\log \left( {\frac{{1 + x}}{{1 - x}}} \right) = 2\left( {x + \frac{{{x^3}}}{3} + \frac{{{x^5}}}{5} - \ldots } \right).

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