Question 344857: There are 12 students fro whom 5 are going to be chosen to represent their school at a conference. If Jack, Anna, or Chris, but only one of them, must be chosen, in how many ways can the students be chosen to go to the conference?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! There are 12 students from whom 5 are going to be chosen to represent their school at a conference. If Jack, Anna, or Chris, but only one of them, must be chosen, in how many ways can the students be chosen to go to the conference?
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# of ways to pick 1 of Jack, Anna, or Chris: 3 ways
# of ways to pick 4 of 9: 9C4
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# of ways to pick 5 of 12 randomly: 12C5
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Probability = [3*9C4]/12C5 = 0.4773
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Cheers,
Stan H.
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