Never mind, I've figured it out now.
n![(1/n-1)! - (1/n!)]
The correct answer is apparently n-1, but I keep getting a different answer. This is what I did:
n![(n!-(n-1)!)/(n-1)!(n!)]
=n/(n-1)!
Could somebody please show me what I've done wrong or what I need to do differently? any help really appreciated!