Suppose that A and B are two events with P(A) = 0.2 and P(B) =
0.3. What are the possible values for the probabilities of A ? B
and A ? B, i.e. P (A ? B) and P(A ? B)? (You need to find a lower
and upper bound for each probability) Hint: Think about the two
extreme cases for A ? B: either: (i) A and B don’t intersect
(mutually exclusive), or (ii) they fully intersect.