6 over 4, which is equal to (6 x 5 x 4 x 3) / (1 x 2 x 3 x 4).
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Four people can be selected from a pool of 8 people in (8 x 7 x 6 x 5) = 1,680 ways.But there are (4 x 3 x 2) = 24 ways to pick the same four people.So you can actually form only 1,680/24 = 70 different 4-person debate teamsfrom a group of 8 students.
The number of ways is 18C5 = 18!/(5!*13!) = 8,568 ways.
There are 8!/(4!*4!) = 70 ways.
Infinitely many.
54,45,5.4,4.5