SOLUTION: there are 3 friends in a class. The teacher calls 2 out of 21 kids at random. What is the probability tht 2 of the friends are called
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Question 959361: there are 3 friends in a class. The teacher calls 2 out of 21 kids at random. What is the probability tht 2 of the friends are called Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! there are 3 friends in a class. The teacher calls 2 out of 21 kids at random. What is the probability tht 2 of the friends are called
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# of ways to succeed:: 3C2 = 3
# of possible outcomes:: 21C2 = 210
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P(choose 2 friends) = 3/210 = 1/70
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Cheers,
Stan H.
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