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28 February, 21:11

Hans is choosing a 2 - letter password from the letters A, B, C, D, and E. The password cannot have the same letter repeated in it. How many such passwords are possible?

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Answers (2)
  1. 28 February, 21:18
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    25 passwords possible
  2. 28 February, 21:40
    0
    There are 5 letters

    there are 5 possibilities for the first letter, and 4 possibilities for the second letter after the first letter is used up

    so 5 * 4 = 20 possibilities
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