Which of the following integers is NOT a divisor of x if x = (21)(3^7) – (127)? Select
A) 2  B) 4  C) 5  D) 12  E) 25
(21)(3^7) is divisible by 3 but 127 is not divisible by 3.   Therefore (21)(3^7) - 127 is not divisible by 3 and thus not divisible by 12.   The answer is 12.
<result>D</result>
Which of the following integers is NOT a divisor of x if x = (21)(3^7) – (127)?