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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 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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