Question

Tentukan nilai n jika C(2n,5)=P(2n,4)

Answer 1

2n C 5 = 2n P 4
(2n) ! / (2n -5)! . 5! = 2n ! / (2n-4)!
(2n-5)! . 5!  / (2n-4)! = (2n)!/(2n)!
(2n-5)! .5! / (2n-4). (2n-5)! = 1
2n -4 = 5!
2n = 124
n = 62