100 Day Summer Challenge

100 problems in 100 days. #100problems

Day 18

18 of 100: Which Digit Is Rare?

If you wrote down all whole numbers from 1 to 1000...

\[ 1, 2, 3, 4, ... , 999, 1000 \]

...which digit would appear the least?

There's a clever way to think of the numbers from 1 to 1000 that will make this problem easier.

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