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At a party there are 30 students over age 21 and 20 students under age 21.

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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