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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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If $log\:_{5.2^{x}+1}^{2}$, $log\:_{2^{x-1}+1}^{4}$ and 1 are in HP, then


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Answer : (c) x is -ve real
Explanation : $\large\frac{2}{log\;_{1+2^{1-x}}^{4}}=1+\large\frac{1}{log\;_{5.2^{x}+1}^{2}}$
answered Jan 23, 2014 by yamini.v

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