Posted by Jake on Tuesday, May 22, 2012 at 11:07am.
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?

math  Reiny, Tuesday, May 22, 2012 at 11:56am
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
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