math

Twenty people apply for seven jobs that are available at fly by night aircraft company

In how many ways could such a group be composed?

After the seven have been selected, in how many different ways could five of them be assigned to the assembly department?

asked by Jake
  1. number of ways to choose 7 from 20
    = C(20,7) = 77520

    For each of those, the number of ways you can choose 5 out of the 7 is C(7,5) = 21

    posted by Reiny

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