sameakamou5wf8 sameakamou5wf8

10-08-2017
Mathematics

contestada

Susan 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 :

musiclover10045 musiclover10045

10-08-2017

1st letter can be any of 5 letters

2nd letter can be 5-1 any of 4 letters

5*4 = 20

there are 20 possible passwords

Answer Link

apologiabiology apologiabiology

10-08-2017

slot method

2 slots possible
1st slot has 5 choices: A,B,C,D,E
2nd has 4 choices since 1 was already chosen for the first slot

so total is 5*4 or 20 diffferent passwords

Answer Link

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