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A, B, C and D are four different physica...

A, B, C and D are four different physical quantities having different dimensions. None of them is dimensionless. But we know that the equation `AD= C 1n(BD)` holds true. Then which of the combination is not a meaningful quantity :-

A

`(A-C)/(D)`

B

`(C)/(BD)-(AD^2)/(C)`

C

`A^2B^2C^2`

D

`(A)/(B)-C`

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