Find the value of C(n r)

Find the value of C(n,r) @DeeptiMukherjee1
This conception is very useful for binomial expansion and probability in mathematics. I think viewers have the knowledge of factorial of a number. factorial 7 is denoted as 7!
So 7!=7*6*5*4*3*2*1. After calculating the factorial of a number we can understand the combination formula.
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