Mathematics, 09.02.2022 14:10 Arealbot

An English class consists of twenty-one students, and four are to be chosen to give speeches in a school competition. In how many different ways can the teacher choose the team, given the following conditions? (a) The order of the speakers is important. (b) The order of the speakers is not important.

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An English class consists of twenty-one students, and four are to be chosen to give speeches in a sc...