Question: 1) The System Administrator has set the following rules for the password: The password is a string made of 10 characters. The available characters are

1) The System Administrator has set the following rules for the

1) The System Administrator has set the following rules for the password: The password is a string made of 10 characters. The available characters are Hexadecimal digits 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E, and F. Repetition is allowed unless otherwise stated a) How many passwords with at least seven A's and at least one B, have no adjacent B's? Explanation: Answer: b) How many passwords have exactly two distinct digits? AABBA AAAAB is an example of such string. Explanation: Answer: c) How many passwords have six digits from the set 0,1,2,3,4,5,6,7,8,9 (repetition is allowed) and four digits from the set A,B,C,D,E,F (no repetition is allowed)? Explanation: Answer: d) How many passwords have sum of all digits equal to 18? Some examples of such passwords are 0A000 10007, 1122621111 and 002000001F ? Explanation

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