A hotel reservation number consists of 4 numbers followed by 1 letter. How many different reservation numbers are possible

Permutations factorials and combinations
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Range of numbers is 0000 to 9999, which is 10000 if zeroes are allowed as prefixes, otherwise the range is 1000 to 9999 which is a range of 9000. There are 26 alphabetic letters, so the total range is 260000 or 234000 depending on what numbers are allowed.

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