SOLUTION: 9 character password has four numbers (from 1 to 7) followed by two letters (from A to Z) followed by three more numbers (from 1 to 7).
A) How many different passwords can be fo
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-> SOLUTION: 9 character password has four numbers (from 1 to 7) followed by two letters (from A to Z) followed by three more numbers (from 1 to 7).
A) How many different passwords can be fo
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Question 636117: 9 character password has four numbers (from 1 to 7) followed by two letters (from A to Z) followed by three more numbers (from 1 to 7).
A) How many different passwords can be formed?
B) How many different passwords have no repeated letters or numbers?
would this be 26*7?
Any help would be greatly appreciated. thank you Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! 9 character password has four numbers (from 1 to 7) followed by two letters (from A to Z) followed by three more numbers (from 1 to 7).
A) How many different passwords can be formed?
Ans: 7^4*26^2*7^3 = 7^7*26^2 = 556715068
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B) How many different passwords have no repeated letters or numbers?
Ans: 7*6*5*26*25*4*3*2 = 7!*26*25 = 3276000
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Cheers,
Stan H.
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