If 18!/3^x is an integer, what is the greatest possible value of x?
Choose one:
A) 3 B) 4 C) 5 D) 6 E) 8
18 - 3*3*2   15 - 5*3   12 - 4*3   9 - 3*3   6 - 2*3   3 - 1*3   Hence max of 3^8 is allowed. IMO 8.
<result>E</result>
If 18!/3^x is an integer, what is the greatest possible value of x?