If ${\log _4}5 = a$ and ${\log _5}6 = b,$ then ${\log _3}2$ is equal to
If ${\log _4}5 = a$ and ${\log _5}6 = b,$ then ${\log _3}2$ is equal to
- A
${1 \over {2a + 1}}$
- B
${1 \over {2b + 1}}$
- C
$2ab + 1$
- D
${1 \over {2ab - 1}}$
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- [IIT 1990]
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