a computer system uses passwords that consist of 5 upper case letters.Assume you can choose from A,E,I,O,U,andY.how many different
passwords can be created if
(i)each letter can be used more than once
(ii)each letter can be used only one time
(iii)each letter can be used only one time and letter A must be used
關於機會率ge問題
2009-03-05 4:12 am
回答 (1)
2009-03-05 4:52 am
✔ 最佳答案
(i)each letter can be used more than once6*6*6*6*6 = 7776 different passwords
(ii)each letter can be used only one time
6*5*4*3*2 = 720 different passwords
iii)each letter can be used only one time and letter A must be used
5*(5*4*3*2) = 600 different passwords
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