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Counting Problems

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braddsesp | 18:14 Wed 13th Sep 2017 | Quizzes & Puzzles
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Car registration plates in GB include a random sequence of three letters.Any letters other than I or Q can be used and the same letter can appear more than once. How many different three letter codes could be used ?.
Help win an argument please.
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24x24x24=13824
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THANK YOU
Can Z be used? I didn't think it was, which reduces the options to 23x23x23. No calc handy!
Looks like it can, sorry!

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