NC3 = 56 nilai n adalah… (pelajaran kombinasi)

 n C 3 = 56
n ! / (n-3)! 3! = 56
n(n-1)(n-2) (n-3)! /(n-3)! = 56. 3!
n(n-1)(n-2) = 8 (7)(6)
n = 8