perplexus.info :: Numbers : A Quickie, not tricky

Home > Numbers

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

No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)

re(4): Solution spoiler.....Now list them ALL!

| Comment 6 of 7 |

I think you hit upon the way I can remember which is which:

Ordered pair = order matters.

Posted by Jer on 2015-05-11 12:48:26

Please log in:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (16)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info