A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?

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03-09-2014
Mathematics

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A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?

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Konrad509idn Konrad509idn · Answer 1 · 2014-09-03T10:26:11-04:00

Konrad509idn Konrad509idn

03-09-2014

[tex]{30 \choose 4}=\frac{30!}{4!26!}=\frac{27\cdot28\cdot29\cdot30}{2\cdot 3\cdot4}=27\cdot7\cdot29\cdot5=27405[/tex]

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