Assertion (A): Though milligram is the unit of mass it is not a
fundamental unit.
Reason (R): All practical units need not be fundamental unit.
a) A and R are correct, R is a correct explanation of A
b) A and R are correct, R is not a correct explanation of A
c) A is true but R is false d) A is false but R is true
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option a ..,.....is the answer.......
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