How many 4-letter code words are possible using the first 8 letters of the alphabet with no letters repeated? how many codes are there when letters are allowed to repeat?

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asked Dec 9, 2018 28.3k views

3 votes

How many 4-letter code words are possible using the first 8 letters of the alphabet with no letters repeated? how many codes are there when letters are allowed to repeat?

Mathematics
high-school

Josh Beam asked

by Josh Beam

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1 Answer

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With no letters repeated:
8*7*6*5 = 1680
When letters are allowed to repeat:
8^4 = 4096

George Wood answered Dec 13, 2018

by George Wood

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