Mathematics for IGCSE & O level - Probability (Section 4 - No. 10)
If the probability of winning the first hockey match is 0.6, and if they win the first match, the probability of winning the second is 0.7, otherwise 0.4. What is the probability they win one of the first two matches?
0.66
0.86
0.70
0.42
Explication
Winning one match: (win first and lose second) OR (lose first and win second). (0.6*0.3) + (0.4*0.4)=0.18+0.16=0.66