Question
A bag contains 8 yellow balls, 7 orange balls, and 3
blue balls. Two balls are drawn at random. Find the probability that the two balls are yellow.Solution
Number of ways of selecting two yellow balls = 8 Câ‚‚
Total number of balls = 8 + 7 + 3 = 18
Number of ways of selecting two balls = 18 Câ‚‚
Probability = 8 Câ‚‚ Ă· 18 Câ‚‚ = (8 Ă— 7) Ă· (18 Ă— 17) = 56 Ă· 306 = 28/153
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