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20 people attended a meeting in Washington. In how many ways can a t [#permalink]
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from 20 you need to take out 4 people and then 6. Therefore you will end with 10 people and 4 to choose among

\(\dfrac{10!}{4!*6!}=210\)
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20 people attended a meeting in Washington. In how many ways can a t [#permalink]
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