The question goes like this:

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.

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