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08-06-2017
Mathematics

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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?

Respuesta :

duanolivia duanolivia

08-06-2017

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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08-06-2017

25 passwords possible

Answer Link

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