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How Many Combinations?

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fiesata | 22:08 Thu 07th Feb 2013 | Quizzes & Puzzles
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Not a quiz as such and no prizes for the answer but I've been trying to work this out to no avail

On modern vehicle number plates like AB 12 AAA the last three letters are random
My question is how many combinations of three letters are there - from AAA to ZZZ and what is the formula for working this out ?

Many thanks

Paul
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If we ignore the factors that I'll mention below, there are 26 possibilities for each position so that's 26 x 26 x 26 = 17576. However, in practice, certain letters aren't used in car registration numbers. (I & Q aren't used within the last three). So the sum becomes 24 x 24 x 24 = 13824.
22:15 Thu 07th Feb 2013
2600
If we ignore the factors that I'll mention below, there are 26 possibilities for each position so that's 26 x 26 x 26 = 17576.

However, in practice, certain letters aren't used in car registration numbers. (I & Q aren't used within the last three). So the sum becomes 24 x 24 x 24 = 13824.
I hope that Beejay1124 wasn't in my class when I taught maths ;-)
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Thanks for the replies very much appreciated - Buenchico I hadn't thoguth about the letters not used (Doh!) 10/10 for you A+ etc
Letters that spell out rude words aren't used either.
And I doubt if UDA, UFF, UVF, or IRA, would ever appear on a number plate

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