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?
2 answers:
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
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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