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A Simpe Probability Problem

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At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.

You have given every student at the party the same chance to be interviewed: what is that chance?

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This is the solution of a simple probability problem.

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The required probability is 1/10

There are 30 students of age over 21. From that group 3 ...

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