Question 935248: hi,can anyone teach me how to solve this type of question?
A password for a system access consists of upper case alphabets A to Z and numerics 0 to 9 and special character @,(,),/
A)if the password consists of 3 alphabets 3 numerics and 2 special character ,then how many password can be formed?
B)if repetition is not allowed how many password of 3 alphabets 3 numerics and 2 special character are possible?
thanks!
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! the password consists of 3 alphabets, 3 numerics, and 2 special characters.
there are 26 upper case alphabes (A to Z).
there are 10 numerics (0 to 9)
there are 4 special characters.
with repetition, the possible number of codes are:
(26*26*26) * (10*10*10) * (4*4)
without repetition, the number of possible codes are:
(26*25*24) * (10*9*8) * (4*3)
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