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If log 15=a and log75=b, then log(75)45...

If `log 15=a` and `log75=b`, then ` log_(75)45 is:`

A

`(3b-a)/(a)`

B

`(b-3a)/(a)`

C

`(3a-b)/(b)`

D

`(a-3b)/(b)`

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