" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
(n-1)(n-2)(n-3) ! / (n-3)! = 30
(n-1)(n-2) = 30
(n-1)(n-2) = (6)(5)
n-1= 6 --> n = 7