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https://math.answers.com/math-and-arithmetic/How_many_4_letter_codes_are_there_if_letters_are_not_repeated

How many 4 letter codes are there if letters are not repeated? - Answers

If letters cannot be repeated, then there are 26 options for the first letter. There are then 25 options for the second letter. There are then 24 options for the third letter, and 23 for the fourth. This means that in total there are 26x25x24x23 options for the code. 26x25x24x23 = 358,800. Thus, there are 358,800 possible 4 letter codes.



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How many 4 letter codes are there if letters are not repeated? - Answers

https://math.answers.com/math-and-arithmetic/How_many_4_letter_codes_are_there_if_letters_are_not_repeated

If letters cannot be repeated, then there are 26 options for the first letter. There are then 25 options for the second letter. There are then 24 options for the third letter, and 23 for the fourth. This means that in total there are 26x25x24x23 options for the code. 26x25x24x23 = 358,800. Thus, there are 358,800 possible 4 letter codes.



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https://math.answers.com/math-and-arithmetic/How_many_4_letter_codes_are_there_if_letters_are_not_repeated

How many 4 letter codes are there if letters are not repeated? - Answers

If letters cannot be repeated, then there are 26 options for the first letter. There are then 25 options for the second letter. There are then 24 options for the third letter, and 23 for the fourth. This means that in total there are 26x25x24x23 options for the code. 26x25x24x23 = 358,800. Thus, there are 358,800 possible 4 letter codes.

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      If letters cannot be repeated, then there are 26 options for the first letter. There are then 25 options for the second letter. There are then 24 options for the third letter, and 23 for the fourth. This means that in total there are 26x25x24x23 options for the code. 26x25x24x23 = 358,800. Thus, there are 358,800 possible 4 letter codes.
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