The Multiplication Principle

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How many three-letter (including nonsense words) are there in which successive letters are different?

Apr 5th, 2015

it is 3P26 = 26*25*24 = 15600,  the first letter we have 26 choices, the second 25 and the third 24. so total of 26*25*24

Apr 5th, 2015

Thank you for confirming my answer!

Apr 5th, 2015

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Apr 5th, 2015
Oct 20th, 2017
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