Mathematics for IGCSE & O level - Probability (Section 6 - No. 36)

A bag contains 3 red marbles, 4 blue marbles, and 2 green marbles. What is the probability of randomly selecting a blue marble?

1/3

4/9

1/2

2/9

The probability is calculated by dividing the number of favorable outcomes (4 blue marbles) by the total number of outcomes (9 marbles total).