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Three balls are drawn from a bag contain...

Three balls are drawn from a bag containing 5 red, 4 white and 3 black balls. The number of ways in which this can be done, if atleast 2 are red, is.

Text Solution

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Required number of ways ` = ""^(5)C_(2) xx ""^(7)C_(1) + ""^(5)C_(3)" "` [since, at least two red]
`= 10 xx 7 + 10`
`= 70 + 10 = 80`
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