How do you do 4b?

4a. [2 marks] Two events A and B are such that P(A) = 0.62 and P(A n B) = 0.18. Find P(An B)). 4b. [4 marks] Given that P((A U B)' ) = 0.19, find P(A | B' ). 5a. [2 marks] Events A and B are independent with P(An B) = 0.2 and P(A' 0 B) - Find P(B)