Question

Answer of 6 one plzzzzz help me out

Answer 1

b option is coorrect so it's right

Answer 2

36a^5b^2=18*2*a^3*a^2*b^2
90a^3b^4=18*5*a^3*b^2*b^2
in above take common multiple the answer is 18a^3b^2