Q25 / 54 · JEE Advanced 2018 (Paper 1) · Mathematics

The value of log2⁡921log2⁡log2⁡9×71log4⁡7 is_____.

Correct answer: 8

Solution

log2⁡92log2⁡log2⁡9×712log4⁡7
= ( log 2 9 ) 2 log ( log 2 9 ) 2 × 7 1 2 log 7 4
= ( log 2 9 ) log ( log 2 9 ) 2 2 × 7 log 7 4 1 2
= 2 2 × 4 1 2
=  4×2=8

Hence, the correct answer is 8.

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