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C(n,k) = n! / k! (n-k)!
C(15,2) = 15! / 2! (15-2)!
C(15,2) = 15 x 14 x 13 / 2 x 13
C(15,2) = 15 x 7
C(15,2) = 105
Mohon maaf apabila ada kesalahan