If {x} is the product of all even integers from 1 to x inclusive, what is the greatest prime factor of {22} + {20}?
Choose the most appropriate option:
A) 23 B) 20 C) 11 D) 5 E) 2
Soln:   {22} + {20} = 22*{20} +{20} = 23*{20}   23NSWER:23
<result>A</result>
If {x} is the product of all even integers from 1 to x inclusive, what is the greatest prime factor of {22} + {20}?