If a and b are two different prime numbers, which of the following cannot be true? Choose the correct choice from the following choices: A) ab is odd. B) a/b is an integer C) a +b is odd. D) ab is even. E) a + b is even
A prime number is a positive integer with exactly two distinct positive divisors: 1 and itself. So, a prime number cannot be a multiple of another prime number. Which makes option C not possible (a/b=integer means that a is a multiple ofb).   Answer: C.   All other options are possible:   A. ab is odd --&gt; a=3 and b=5;   B. a + b is even --&gt; a=3 and b=5;   C. a + b is odd --&gt; a=2 and b=3;   D. ab is even --&gt; a=2 and b=3;   a +b is odd.
<result>C</result>
If a and b are two different prime numbers, which of the following cannot be true?