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

Question

tresset_1 [31]

2 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] · Answer 1 · 2022-06-10T15:23:31+03:00

BlackZzzverrR [31]2 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] · Answer 2 · 2022-06-10T13:46:19+03:00

NikAS [45]2 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