b) Let P and Q be events in a sample space S, and let R=S(PQ). Given P(P)=0.4,P(Q)=0.5, and P(PQ)=0.2. Find each of the following: i. P(PQ) (2 Marks) ii. P(R) (2 Marks) iii. P(PCQC) (2 Marks) iv. P(PCQC)