How many positive integers less than 5,000 have at most two different digits.

Question

+1

451

2

Guest Feb 4, 2019

Guest · Answer 1 · 2019-02-04T11:02:24

Give an example of what you mean by "at most two different digits".

itsyaboi · Answer 2 · 2019-02-04T11:57:29

read this: https://artofproblemsolving.com/wiki/index.php?title=2004_AIME_II_Problems/Problem_4