Question

Nilai n yang memenuhi nC3=2n, maka tentukan 2nC8

Answer 1

Verified answer

Kombinasi

nC3 = 2 n

n! /(n-3)! . 3!  = 2 (n)
n ! /(n-3)! = 3! . 2 (n)
n(n-1)(n-2)(n-3)! / (n-3)! =  3.2.1.2.n
n(n-1)(n-2)  = 4(3) n
(n-1)(n-2) = 4(3)
n - 1 = 4 --> n = 5