# FAQ: Permutations and Combinations: Lesson - Enumerations With Repetition

This community-built FAQ covers the “Enumerations With Repetition” exercise from the lesson “Permutations and Combinations: Lesson”.

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## FAQs on the exercise Enumerations With Repetition

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Hi there! In the second part of the lesson, there has the question: “How many four-digit numbers are possible? Assign your answer to the `four_digit_number` variable.”

I understand that has 10 digit, but why 10000 of possibilities, instead of 9000? Because, in possibilities 0 _ _ _, this number don’t have four digit, right?

``````1000  =>  smallest four digit number
``10 ** 4 - 10 ** 3``