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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asked Jan 26, 2018 189k views

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Wakana · Answer 1 · 2018-02-01T16:24:16+0000

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

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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