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An alphagram is a string of letters, such as ABC or AABEGLR, whose letters are in alphabetical order. Find the number of four-letter alphagrams.

 Oct 31, 2020
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1 - Without repeating the letters, you have: 26 nCr 4 =14,950 alphagrams.

 

2 - If each letter can be repeated up to 4 times, then you have: [26 + 4 - 1] nCr 4 =23,751 alphagrams.

 Oct 31, 2020

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