The events A and B are such that P(A)=0.6, P(B)=0.3 and P(A|B)=0.2. Find the probability that

(i) both A and B occur,

**(ii) at least one of A and B occurs,**

(iii) exactly one of A and B occurs.

(iii) exactly one of A and B occurs.

I'm fine with part (i) but have no idea how to go about solving (ii) and (iii).

Could somebody help me with it? Please give some explanations! Thank you very much (Talking)