exam Maths Puzzle Numerical Ability

I need to Find the greatest common factor of this set of monomials:

16a^5b^2, 36a^2b

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exam Other Question

Does every infinite set has the same cardinality (number of elements). What is a meter? I know that it is a member of the metric unit, but I need to know what the meaning of it is. I also need the same thing about these:

kilometer(km)(I think I already know this one though, one km=0.62miles?)

kilogram(kg)