Logarithms

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Question : 56 of 85

Marks: +1, -0

If

\log 2=a, \log 3=b, \log 7=c

and

6^{x}=7^{x+4}

, then

x=

$\;{4 a b}/{b+a-c}$
$\;{4 c}/{a+b-c}$
$\;{4 b}/{c-a-b}$
$\;{4 a}/{a+b-c}$

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