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It has 5 digits. There is a 4 in the ten thousands place. None of the other digits is a 4. What is the smallest number that this mystery number can be?

Sagot :

We first consider the lowest number that can be used to get the mystery number. Since we can not use 0 since if we put 0 before 4,000, it will only have 4 digits. So we use 1. Now we have 14000.