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A - Z means you can use the whole alphabet, which usually contains 26 letters.

So a one-letter code would give you 26 permutations.

2 letters will give you 26 x 26 permutations.

A three letter code, finally, will give you 26 x 26 x 26 , provided you don't have any restrictions given, like avoiding codes formed from 3 similar letters and such.

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Q: How many permutations are there in a 3-letter code which can use the letters from A to Z inclusive?
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