Question 200291
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I have to presume you meant <i>What is the sum of the non-prime<b> factors </b>of 12</i>.


First, list and categorize all of the integers from 1 to 12 inclusive:


1, factor of 12 and not prime by definition


2, factor of 12 but prime


3, factor of 12 but prime


4, factor of 12 and not prime because divisible by 2


5, not a factor of 12


6, factor of 12 and not prime because divisible by 2 and 3


7, 8, 9, 10, and 11, not a factor of 12


12, a factor of 12 and not prime because divisible by 2 and 3


So the factors that fit the criteria are 1, 4, 6, and 12.  Add 'em up.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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