SOLUTION: A bag contains 20 tennis balls which 4 are defective. If two balls are selected at random from the bag, what is the probability that both are defective?
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-> SOLUTION: A bag contains 20 tennis balls which 4 are defective. If two balls are selected at random from the bag, what is the probability that both are defective?
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Question 507795: A bag contains 20 tennis balls which 4 are defective. If two balls are selected at random from the bag, what is the probability that both are defective? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A bag contains 20 tennis balls which 4 are defective. If two balls are selected at random from the bag, what is the probability that both are defective?
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# of ways to select 2 defective: 4C2 = 6
# of ways to select 2 balls randomly: 20C2 = 190
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P(select 2 defective) = 6/190
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Cheers,
Stan H.
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