Mathematics for IGCSE & O level - Probability (Section 1 - No. 38)
If two events, A and B, are independent, P(A) = 0.3 and P(B) = 0.6. What is the probability of A or B?
0.18
0.3
0.6
0.72
설명
P(A or B) = P(A) + P(B) - P(A and B). P(A and B) = 0.3 * 0.6 = 0.18. P(A or B) = 0.3 + 0.6 - 0.18 = 0.72