What is the greatest value of n such that 4^n is a factor of 23! ? Pick:
A) 8	B) 4	C) 7	D) 5	E) 9
Pretty simple, really.   If m = 9, then 4m = 36, which is 18x2, both of which are included in 23!   Since 9 is the largest number here, its the answer.   Answer is 9
<result>E</result>
What is the greatest value of n such that 4^n is a factor of 23! ?