Question
A box contains 8 green balls, 6 blue balls and 6 yellow
balls. Two balls are drawn at random. What is the probability that at least one of them is yellow?Solution
Total balls = 8 + 6 + 6 = 20
Non-yellow balls = 8 + 6 = 14
Required probability = 1 - Probability that none is yellow
= 1 - (14/20) × (13/19)
= 1 - (182/380)
= 1 - (91/190)
= 99/190
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