Mathematics for IGCSE & O level - Probability (Section 1 - No. 37)
A fair coin is flipped twice. What is the probability of getting two heads?
1/2
1/4
1/3
3/4
Giải thích
The probability of getting heads on one flip is 1/2. The probability of getting heads twice is (1/2)*(1/2)=1/4.