Mathematics for IGCSE & O level - Probability (Section 3 - No. 48)
If the probability of rolling a prime number on a six-sided die is 1/2, what is the probability of *not* rolling a prime number?
1/6
1/3
1/2
2/3
הֶסבֵּר
The probability of the event not happening is 1 - (probability of event happening).