Hi, I need help to find the answer for the following question (Regular expression. Operations on languages)

Let P={011, 01, 01101, 010}, Q={0, 010, 0011} then find

i) PQ

ii) QP

iii) $\displaystyle P^2$

iv) $\displaystyle Q^3$

here I found for question

i) PQ={0110, 011010, 0110011, 010, 01010, 010011, 0100, 101010, 0100011}

ii) QP={0011, 001, 001101, 0010, 010011, 01001, 01001101, 010010, 0011011, 001101, 001101101, 0011010}

Plz give me comments abt my above answer for i) and ii) then I need help to other 2