Question: A popular website requires users to create a password consisting of digits (0-9) or letters (English alphabet). The password is non case-sensitive. (a) How

A popular website requires users to create a password consisting of digits (0-9) or letters (English alphabet). The password is non case-sensitive. (a) How many passwords can be formed, if they must be six characters long? (b) How many passwords can be formed, if they must be between six and eight char- acters long? (c) How many eight-character passwords can be formed, if characters cannot repeat? (d) How many eight-character passwords can be formed, if exactly three characters must be letters? (e) How many five-character passwords can be formed, if at least two characters must be letters, and letters cannot repeat?

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Answer a 626 56800235584 b 626 627 628 2176782336896 c 62 61 60 59 58 57 1346262400 d 26 26 26 10 10 10 17576000 e 26 25 10 10 10 65000 Explanation a The number of passwords that can be formed if they ... View full answer

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