If n is an integer, which of the following CANNOT be a factor of 3n+4?
Choose the correct choice from the following answers:  A) 4  B) 5  C) 6  D) 7  E) 8
3n+4=3(n+1)+1 cannot be a multiple of 3, it's 1 more than multiple of 3: ... 4, 7, 10, 13, 16, ... Hence it cannot be a multiple of  2*3= 
<gadget id="calculator"> 2*3</gadget>
<output>6</output>
6 as well.   Answer: 6.
<result>C</result>
If n is an integer, which of the following CANNOT be a factor of 3n+4?