math
posted by Jake .
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
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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