What is the greatest positive integer x such that 3^x is a factor of 9^6?
Choose the correct answer.
A) 5 B) 12 C) 10 D) 20 E) 30
What is the greatest positive integer x such that 3^x is a factor of 9^6?   9^6 = (3^2)^6 = 3^12   B. 12
<result>B</result>
What is the greatest positive integer x such that 3^x is a factor of 9^6?