Mathematics for IGCSE & O level - Probability (Section 6 - No. 17)
If the probability of an event occurring is 2/3, what is the probability of that event *not* occurring?
1/3
2/3
0
3/2
Forklaring
The probability of not occurring is 1 - the probability of occurring. 1 - 2/3 = 1/3.