Mathematics for IGCSE & O level - Probability (Section 5 - No. 16)
If two events, A and B, are mutually exclusive, and the probability of A is 0.2 and the probability of B is 0.3, what is the probability of A or B happening?
0.6
0.5
0.06
0.1
คำอธิบาย
P(A or B) = P(A) + P(B) since mutually exclusive. 0.2+0.3 = 0.5