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21-11-2019
Mathematics

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How many different three-letter passwords can be formed from the letters A, B, C, D, E, and F if no repetition of letters is allowed?

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anne2833 anne2833

21-11-2019

Without any restrictions on the number of repetitions, we found 216 three-letter words. Of those, there are exactly 6 which have letters repeated 3 times (AAA, BBB, CCC, DDD, EEE, and FFF).

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