Answers
(a) The number of possible passwords is calculated as follows: Number of passwords = 31X31X31X31X31X31X31X31X31X31 Because for each place we have 26 letters plus 5 special symbols. (6) The number of possible passwords is calculated as follows: Number of passwords = 31x30 x 29 x 28 x 27 x 26 x 25 x 24 x 23 x 22 Because each time one value will be reduced by one. (c) The number of possible passwords is calculated as follows: 26! Number of passwords=0 26 x 25 x 24 x 23 x 22 x 21 x 20 x19x18x17 Because 26 letters can be arranged in alphabetical order and if they don't need to be repeated the denominator term will have 10 values as shown above. (d) The number of possible passwords is calculated as follows: 26! Number of passwords == 26 x 25 x 24 x 23 x 22 x 21x 20 x19x18x17 Because 26 letters can be arranged in alphabetical order and repetition is allowed. Good luck with your studies!!!
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