two events A and B are defined in a sample space

a) Two events A and B are defined in a sample space. Given P(A U B) = 0.85, P(B) = 0.4 and P(A' U B') = 0.9. Determine i) P(An B ) (3 marks) ii) P(An B') (3 marks) iii) P(A). Are A and B statistically independent events? Explain