If a positive integer n is divisible by both 3 and 5, then n must also be divisible by which of the following?
I. 15
II. 8
III. 45  Options:
A) None
B) I only
C) II only
D) I and II
E) II and III
A multiple of 3 and 5 is also a multiple of 15, but not necessarily a multiple of 8 or 45.   The answer is I only.
<result>B</result>
If a positive integer n is divisible by both 3 and 5, then n must also be divisible by which of the following?
I. 15
II. 8
III. 45