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tresset_1 [31]
3 years ago
13

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 i

t. How many such passwords are possible?
Mathematics
2 answers:
BlackZzzverrR [31]3 years ago
4 0
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
NikAS [45]3 years ago
3 0

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

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