Three events E1 , E2 and E3, deﬁned on the same sample space Ω, have probabilities P(E1) = P(E2) = P(E3) = 1/4. Let E0 be the event that one or more of the events E1,E2,E3 occurs.
1. Find P(E0) when:
(a) Events E1,E2 and E3 are disjoint.
(b) Events E1,E2 and E3 are independent.