ReumenJariap ReumenJariap

03-06-2017
Mathematics

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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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Alina6211 Alina6211

03-06-2017

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

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