If n = 20! + 15, then n is divisible by which of the following?
I. 15
II. 17
III. 19  Choose the correct choice from the following answers:
A) I only  B) II only  C) III only  D) I and II  E) II and III
15 divides 20! so 15 also divides 20! + 15.   17 and 19 divide 20! so they do not divide 20! + 15.   The answer is I only.
<result>A</result>
If n = 20! + 15, then n is divisible by which of the following?
I. 15
II. 17
III. 19