Explain probability and kind of sample

Reference no: EM13130529

At a party there are 25 students over age 21 and 20 students under age 21. You choose at random 5 of those over 21 and separately choose at random 4 of those under 21 to interview about attitudes toward alcohol. You have given every student the same chance to be interviewed.

What is that chance?
What is this kind of sample called?

Reference no: EM13130529

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