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August 28, 2014

August 28, 2014

Posted by **Bob** on Thursday, October 27, 2011 at 4:48pm.

A) 2,3,12,24

B) 1,5,10

C) 1,3,5,15

D) 1,31

- Math -
**Steve**, Thursday, October 27, 2011 at 5:22pmnot A, since 6 is not included

not B, since 2 is not included

not D, since 31 is prime

C

- Math -
**MathMate**, Thursday, October 27, 2011 at 5:24pmNot sure if "a composite number" is meant to be the largest composite number of each group. If this is so, then check the factors of the largest number of each group to see if they are all named. For example, the factors of 31 are 1 and 31. So all integer factors are named.

There are two choices where all factors are named, and the other two name all the factors (like D).

However, only one of the choices contains a "composite number" as the largest number, i.e. not a prime.

Can you find it?

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