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.
Time: a few seconds to wonder if a set with one member should count.
I'm now wondering if ordered means
Should also count. That always confuses me.
Posted by Jer
on 2015-05-11 09:41:43