Mathematics for IGCSE & O level - Probability (Section 6 - No. 24)
A bag contains 5 red marbles and 3 blue marbles. What is the probability of selecting a red marble, replacing it, and then selecting a blue marble?
15/64
5/8
3/8
15/32
설명
P(red) = 5/8, P(blue) = 3/8. Because the marble is replaced, the probabilities remain the same. Therefore, (5/8)*(3/8) = 15/64.