SOLUTION: An urn has 7 balls that are identical except that 3 are white and 4 are red. A sample of 4 is selected randomly without replacement. What is the probability that at least 2 of the

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Question 804553: An urn has 7 balls that are identical except that 3 are white and 4 are red. A sample of 4 is selected randomly without replacement.
What is the probability that at least 2 of the balls are white? (Enter your answer as an exact fraction.)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
An urn has 7 balls that are identical except that 3 are white and 4 are red.
A sample of 4 is selected randomly without replacement.
What is the probability that at least 2 of the balls are white? (Enter your answer as an exact fraction.)
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Ways to win:: 2white&2red ; 3white&1red
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P(at least 2 white) = [3C2*4C2 +3C3*4C1]/7C4 = [3*6+1*4]/35 = 22/35
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Cheers,
Stan H.
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