SOLUTION: In a box there are 7 balls, of which 3 are red and 4 are white. Three balls will be withdrawn at random. Find the probability that at least one ball will be red.
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Question 214732: In a box there are 7 balls, of which 3 are red and 4 are white. Three balls will be withdrawn at random. Find the probability that at least one ball will be red.
Thank you for your help. Best regards Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! In a box there are 7 balls, of which 3 are red and 4 are white. Three balls will be withdrawn at random. Find the probability that at least one ball will be red.
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P(at least one ball is red) = 1 - P(no ball is red)
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P(at least one) = 1 - [4C3/7C3] = 1 - 4/35 = 31/35
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Cheers,
Stan H.
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