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OpenStudy (anonymous):
A teacher wants to send 4 students to the library. If there are 21 students in the class, how many ways can he choose to send 4 students
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OpenStudy (kropot72):
Th required number of combinations is given by \[21C4=\frac{21!}{4!17!}=\frac{21\times 20\times19 \times18}{4\times 3\times2 \times1}=you\ can\ calculate\]
OpenStudy (anonymous):
thank you!
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