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## Odd 1 Out

These brain teasers rely on your ability to recognize groups of common attributes. For each of these puzzles you'll need to figure out why the words or letters are grouped as they are. Sometimes you will be asked to pick the odd-one-out or to place a new word into the correct group.

 Puzzle ID: #29922 Fun: (2.63) Difficulty: (1.64) Category: Group Submitted By: Aquagirl182

Group 1: 3,5,7,11,13, 15, 17

Group 2: 4,6,8,9,10,12,14

What is the "odd" one out in Group 1 that should be in Group 2?

### Hint

Prime and composite numbers

Prime numbers- the only factors that make the number is only by 1 and itself. ex. 5*1=5

Composite- When two factors make the number besides 1 and itself
ex. 10
5*2=10
10*1=10
...and so forth

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 vlerma Apr 20, 2006 Found anothr one that I could manage with the help of your hints. Thanks for the help. ebraham Apr 20, 2006 Hi nice and easy got it on the 2nd try! calmsavior Apr 20, 2006 thats an enourmous hint reddragon Apr 20, 2006 couldn't you also put 9 in group A because it is the only odd number missing? TheEarthling Apr 20, 2006 Very easy, but fun. Aquagirl182 Apr 21, 2006 No you couldn't put 9 in Group 1 because Group 1 is a group of Prime Numbers, not odd numbers.