What is the greatest positive integer W such that 3^W is a factor of 9^10?
Select:
A) 5  B) W=9  C) W=10  D) W=20  E) W=30
What is the greatest positive integer W such that 3^W is a factor of 9^10?   9^10 = (3^2)^10 = 3^20   D. 20
<result>D</result>
What is the greatest positive integer W such that 3^W is a factor of 9^10?