math
posted by FALONGO .
How may committees of size 4 is to be selected from a group of 7 local students and 6 overseas students.

7+6=13 students.
choose 4 to make a committee.
Number of ways
= 13 choose 4
= C(13,4)
= (13,4)
=13!/(4!(134)!)
=13!/(4!9!)
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