3ab^2 3a^2 b

Question

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4ab 4a

Answer 1

(3ab^2)/(4ab) * (3ab^2)/(4a)
= 3b/4 * 3b^2/4
= 9b^3/16

Answer 2

ahem ...
(3ab^2)/(4ab) * (3a^2b)/(4a)
= 3b/4 * 3ab/4
= 9ab^2/16

Answer 3

3ab^2/4ab * 3a^2 b /4a