Mathematics for IGCSE & O level - Probability (Section 4 - No. 42)
In a bag, there are 5 red marbles, 3 blue marbles, and 2 green marbles. What is the probability of randomly selecting a marble that is either red or blue?
3/10
1/2
4/5
8/10
설명
There are 5 red + 3 blue = 8 favorable outcomes. There are a total of 10 marbles. The probability is 8/10 = 4/5.