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.
(In reply to re(3): Solution spoiler.....Now list them ALL!
by Ady TZIDON)
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