Question

A,B,C and D are four different physical quantities having different dimensions and none of them are dimensionless. The relation AD = C ln BD holds true. Which of the following combination is not a meaningful quantity?
1)A^2 - B^2C^2
2)A/B - C
3)A/BD - C/D
4)C/BD - AD^2/C
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Answer 1

Answer:

first option.............