Question

if L,M,N are physical quantities withdifferent dimensions, then which of the following combinations can never be a meaningful quantity.
(1) LM/N
(2)LN-M
(3)LN-M/N
(4)L-M/N
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Answer 1

Answer:

ok so ans is 2,3and 4 because you can't subtract or add different physical quantities they should be same