1.

Three balls are drawn at random from collection of 7 white, 12 green and 4 red balls, The probability that each ballis of different colours is……….

Answer»

`(.^(7)C_(1)xx.^(12)C_(1)xx.^(4)C_(1))/(.^(23)C_(3))`
`(8)/(253)`
`(4)/(253)`
`(1)/(253)`

ANSWER :A


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