<p>a and b are distinct prime integers. Which of the following could not be an integer factor of ab? (A) a (B) a^2 (C) ab/2 (D) 2 (E) None of the above</p>
<p>Is it (B) for sure?</p>
<p>Yes. 10 char…</p>
<p>Since a and b are distinct, b is not equal to a. Since b is prime, b is not divisible by a. So ab is not divisible by aa = a^2, choice ( B).</p>