If {x} is the product of all even integers from 1 to x inclusive, what is the greatest prime factor of {14} + {12}?  Choose the correct answer
A) 23
B) 20
C) 15
D) 5
E) 2
Soln:   {14} + {12} = 14*{12} +{12} = 15*{12}   ANSWER:15
<result>C</result>
If {x} is the product of all even integers from 1 to x inclusive, what is the greatest prime factor of {14} + {12}?