Homework Answers
Here order does not matter.
So we here use combination formula.
When order matters we use permutation formula.
Combination formula.
nCr = (n!) / (r! * (n-r)!)
n = 20
r = 12
20C12 = 20 ! / ( 12! * 8! )
= 125970
125970 ways we can forms a committee of 12 people from 20.
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