If (n+2)!/n!=72, n=? Answers:
A) 7	B) 9	C) 10	D) 11	E) 12
(n+2)!/n!= 72   Rewrite as:[(n+2)(n+1)(n)(n-1)(n-2)....(3)(2)(1)]/[(n)(n-1)(n-2)....(3)(2)(1)]= 132   Cancel out terms: (n+2)(n+1) = 72   From here, we might just TEST the answer choices.   Since (9)(8) = 72, we can see that n = 7   7
<result>A</result>
If (n+2)!/n!=72, n=?