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If `log_(10)5=a` and `log_(10)3=b`,then

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If `log_(10)5=a` and `log_(10)3=b`,then
A. `log_(10)8=3(1-a)`
B. `log_(40)15=((a+b))/((3-2a))`
C. `log_(243)32=((1-a)/b)`
D. All of these
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Correct Answer - A::B::C::D
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