If (n+2)!/n!=90, n=?
Choose the correct option:	A) 2/131	B) 8	C) 10	D) 11	E) 12
(n+2)!/n!= 90   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) = 132   From here, we might just TEST the answer choices.   Since (10)(9) = 90, we can see that n = 8   8
<result>B</result>
If (n+2)!/n!=90, n=?