(n-1)! + (n-2)! = (n-1)(n-2)! + (n-2)!
(n-2)! (n-2)!
= (n-2)! (n-1 + 1)
(n-2)!
= (n- 1 + 1)
= n
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(n-1)! + (n-2)! = (n-1)(n-2)! + (n-2)!
(n-2)! (n-2)!
= (n-2)! (n-1 + 1)
(n-2)!
= (n- 1 + 1)
= n