User:Borealbear
Revision as of 18:22, 30 April 2021 by Borealbear (talk | contribs)
AIME Qual
Congrats on finding this page! Here's a problem I made:
Suppose a positive integer with all digits non-zero is considered if there are fewer than
permutations of its digits. For example,
is
since it has
permutations, (
,
, and
), while
is not since it has
permutations, (
,
,
,
,
, and
). How many
numbers less than
are there?