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7 April, 19:05

A new school randomly assigns a five-character student code to every prospective student. The school uses the characters 1, 2, 3, 4, 5, W, X, Y, Z. If none of the students codes contain a repeated character, what is the total number of codes that can be randomly assigned?

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  1. 7 April, 19:17
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    There are nine elements to choose from and the codes have five non-repeating characters.

    n! / (n-k) !

    9!/4!

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