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