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An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colours is -

saket kumar , 11 Years ago
Grade 12
anser 1 Answers
SHAIK AASIF AHAMED

Last Activity: 10 Years ago

Total number of ways of drawing 3 balls out of 9 is 9c3=84
Number of ways of drawing so that balls are of different colours is (3c1)(4c1)(2c1)=24
Therefore probability is =24/84=2/7.
Thanks and Regards
Shaik Aasif
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