If c+5/d is a prime integer, which of the following must be true?
1.d=5c
2. d is a prime integer
3. c+5/d is ODD. Choices
A) None B) 1 only C) 2 only D) 1 and 2 only E) 2 and 3 only.
I would pick up numbers and do .   i hope the question is (c+5)/d....   let c = 3 , d = 4   3+5/4 = 2 = Prime   1. d is not equal to 5c   2.d is not a prime number   3. (c+5)/y is not odd.   hence None
<result>A</result>
If c+5/d is a prime integer, which of the following must be true?
1.d=5c
2. d is a prime integer
3. c+5/d is ODD.