The greatest common factor of two numbers is 5!. Which of the following can be the second number, if one of the numbers is 9!? Pick one:	A) 3(5!)	B) 4(5!)	C) 6(5!)	D) 5(5!)	E) 7(5!)
GCF is the product of common factors of the numbers involved.   GCF = 5!   a = 9! = 9*8*7*6*5!   b will certainly have 5! and cannot have any more common factors with a (as this will increase the GCF)   Looking at the answers only 5 (5!) and 9! will have GCF as 5!   Ans 5(5!)
<result>D</result>
The greatest common factor of two numbers is 5!. Which of the following can be the second number, if one of the numbers is 9!?