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Question: Answered & Verified by Expert
$7^{2 \log _{7} 5}$ is equal to
MathematicsBasic of MathematicsCOMEDKCOMEDK 2020
Options:
  • A 5
  • B $\log _{7} 35$
  • C $\log _{7} 25$
  • D 25
Solution:
1034 Upvotes Verified Answer
The correct answer is: 25
We have,
$7^{2 \log 5} 5$
$=7^{\log _{7} 5^{2}}$
$=5^{2}$
[ $m \log a=\log a^{m}$ ]
$\left[a^{\log _{a} b}=b\right]$
$=25$

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