Problema Solution
Suppose there is a group of seven people from which we will make a committee.
In how many ways can we pick a two-person committee?
Answer provided by our tutors
We need to find the number of 2-combinations from a given set S of 7 elements:
C(7, 2) = 7!/(2!(7 - 2)!)
C(7, 2) = (6*7)/2
C(7, 2) = 21
There are 21 ways to pick up the committee.