exam Maths Puzzle Numerical Ability

hey
I need to find Greatest Common Factor(GCF)
6a^2b^2 + 18ab^3

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exam Other Question

f1(x) =1/2x + 5 Multiply.
a4b2 times ab3

A) ab6 B) a5b5 C) ab5 D) a4b5


I came up with B as the answer I am right?