An English class consists of twenty-one students, and three are to be chosen to give speeches...
An English class consists of twenty-one students, and three 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 three are
to be chosen to give speeches...
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