n persamaan dari n+1C4=nC3

jawab

(n+1) C 4 = n C 3

(n+1) ! / (n +1 -4)!. 4! = n !/ (n-3)!. 3! 

(n+1)! / ( n-3)!. 4!  =  n!  / (n-3)!. 3!  --> tukar silang

(n + 1)! / (n) ! =  (n-3 )! . 4 ! / (n -3)!. 3!

(n + 1) = 4 !/ 3! 

n + 1 = 4
n = 3



(n + 1)!/ (n !) =  (