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A Quickie, not tricky (Posted on 2015-05-11)

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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re(2): Solution spoiler.....Now list them ALL!

| Comment 3 of 7 |

(In reply to re: Solution spoiler.....Now list them ALL! by Ady TZIDON)

16 ordered sets:

{1}, {2}, {3}, {5}, {1,1}, {1,2}, {1,3}, {2,2}, {2,3},
{1,1,1}, {1,1,2}, {1,1,3}, {1,2,2}, {1,1,1,1}, {1,1,1,2},
{1,1,1,1,1},

Posted by Dej Mar on 2015-05-11 11:09:35

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