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An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ?
- A89/190
- B90/190
- C91/190
- D92/190
Correct answer: C
Discussion 1
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0
CCommunity
91/190
Total possible outcomes
= 20C2 = 20 x 19/1 x 2 = 190
Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91
∴ Required probability = 91/190
Total possible outcomes
= 20C2 = 20 x 19/1 x 2 = 190
Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91
∴ Required probability = 91/190