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28 April, 00:49

If repetition is not allowed, how many 4 letter codes can be formed from only 5 letters of the alphabet?

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  1. 28 April, 03:47
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    Well, If you want 4 letter codes with 5 letters, would be 5 x 4 x 3 x 2 which is 430. (It gets less because If you use one letter you cant use it again.)
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