Which of the following numbers is not prime?  Choose the correct choice from the following answers:
A) 5+6 B) 20-1 C) 3+4 D) 59-6 E) 9+6
Choice A is excluded because 5 can not be factored. Choice B is excluded because 1 has no factors. In Choice C, the number 3 is not able to be factored. Choice D 59 can not be factored. Notice we can factor 3 out of both 9+6. --&gt; 9+6= 3*(3+2). The correct answer is 9+6.
<result>E</result>
Which of the following numbers is not prime?