day date using only the digits 0,1,2
Source: (2022-) 2023 XVI 16th Dürer Math Competition Finals Day 2 E2
May 25, 2024
number theorycombinatorics
Problem Statement
Timi was born in . Ever since her birth how many times has it happened that you could write that day’s date using only the digits , and ? For example, . is such a date.