What is the greatest value of n such that 4^n is a factor of 25! ?  Options.
A) 6
B) 5
C) 7
D) 4
E) 3
Pretty simple, really.   If m = 7, then 4m = 28, which is 14x2, both of which are included in 25!   Since 7 is the largest number here, its the answer.   Answer is 7
<result>C</result>
What is the greatest value of n such that 4^n is a factor of 25! ?