<PRE><B>Question 270975</B>
You are choosing a computer password. The password has 3 letters followed by 3 digits. 
a. How many passwords are possible if the letters must be uppercase?
3 letters: 26^3 ways
3 digits: 10^3 ways
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# of passwords: 26^3*1000
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b. How many passwords are possible if no letter or digit can be repeated and the letters have to be lowercase?
3 letters: 26*25*24
3 digits: 10*9*8
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# of passwords: 26*25*24*10*9*8
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Cheers,
Stan H.
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