Which of the following is an integer?
I. 11! / 6!
II. 11! / 8!
III. 11! / 7!5!
Pick one.
A) I only B) II only C) III only D) I and II only E) I, II and III
11!/6! = 11*10*9*8*7 which is an integer.   11!/8! = 11*10*9 which is an integer.   11!/7!5! = 11*10*9*8 / 5*4*3*2 = 11*3*2 which is an integer.   The answer is I, II and III.
<result>E</result>
Which of the following is an integer?
I. 11! / 6!
II. 11! / 8!
III. 11! / 7!5!