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3. How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?
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3. How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

User Kchoi
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1 Answer

6 votes
Abcdefg
There cannot be more than two because there are only two vowels, e and a. But it has to be 4 lettered, which limits a lot of option, so there can only be one 4-letter code.
User Fleshgrinder
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