If 1/a + 2/a + 3/a is an integer, which of the following must also be an integer?  Select:
A) 12/a	B) 3/a	C) 6/a	D) 9/a	E) 15/a
1/a + 2/a + 3/a   =6/a   Answer 6/a
<result>C</result>
If 1/a + 2/a + 3/a is an integer, which of the following must also be an integer?