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A Quickie, not tricky (Posted on 2015-05-11) Difficulty: 1 of 5
How many ordered sets of positive integers are there if:

1.Their sum is less than 6
2. There are at most 4 addends
3. None of them is composite.

Please specify how quick were you to get the right answer.

No Solution Yet Submitted by Ady TZIDON    
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Solution spoiler | Comment 1 of 6
seven

1
2
3
5
1,2
1,3
2,3

Time:  a few seconds to wonder if a set with one member should count. 

I'm now wondering if ordered means 
2,1
3,1
3,2 
Should also count. That always confuses me. 


  Posted by Jer on 2015-05-11 09:41:43
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