C2, find "C2" – InterviewSolution

1.

C2, find "C2"

Answer»

If ⁿCₓ = ⁿCᵤ then, x + u = n

Here, nC8 = nC2so, according to results , n = 8 + 2 = 10 hence, n = 10

Then,nC2 = 10C2 = 10!/2!(10-2)! = 10*9*8!/2*1*8! = 90/2 = 45

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