Question

((n+3)!-n!)/n!=719, then n =?

Answer 1

Answer: 7

Step-by-step explanation:

(n+3)!/n! - 1 = 719

(n+3)(n+2)(n+1)n!/n! = 720

(n+3)(n+2)(n+1) = 10*9*8

n+3 = 10

n=7

Answer 2

(n+3)-n /n= 719

2n-3n/n=719

-1n/n=719

-1×1/n=719

-1/n= 719

-1-719=n

-720=n,,