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Curiosity spawns fantastic creativity


Feb
28
revised Finding all permutations containing B elements from a set of size A elements
Changed title
Feb
28
comment Finding all permutations containing B elements from a set of size A elements
I'm looking for the permutations.
Feb
28
revised Finding all permutations containing B elements from a set of size A elements
Replaced "subset" with "permutation"
Feb
28
comment Finding all permutations containing B elements from a set of size A elements
Partially right. However this doesn't account for the ordering of the elements.
Feb
28
comment Finding all permutations containing B elements from a set of size A elements
No, it needs to include the cases where some elements don't appear at all.eg. {x,x,x,y,y} should be a valid subset.
Feb
28
comment Finding all permutations containing B elements from a set of size A elements
Yes. All combinations are wanted. Then subsequently a way of finding out the number of special cases.eg. all subsets with the same first 2 leading elements, sets with x as first two leading elements, etc.
Feb
28
awarded  Editor
Feb
28
revised Finding all permutations containing B elements from a set of size A elements
Added relevant tags. Specified size of B relative to A.
Feb
28
asked Finding all permutations containing B elements from a set of size A elements
Nov
24
awarded  Scholar
Nov
24
comment Number of distinct strings in regular expression
Thanks @sperners lemma!
Nov
24
accepted Number of distinct strings in regular expression
Nov
16
awarded  Student
Nov
16
asked Number of distinct strings in regular expression