FAQ: Permutations and Combinations: Lesson - Enumerations With Repetition

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

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This exercise can be found in the following Codecademy content:

Computer Science

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?

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Good point. Given that numbers do not start with zero,

1000  =>  smallest four digit number

9999  =>  largest four digit number

9999 - 1000 + 1  ==  9000

Or,

10 ** 4 - 10 ** 3
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