Question

Using these sets

Numerals = {0, 1, 2, 3, 4,5}

Letters = {a, b, c, u, x, y, z}

Symbols = {@, #, $, %, ^, &}

Compute the number of passwords for the following:

a) Passwords of length 5 that may include numerals, letters, and symbols but must start with a symbol and have no repeated characters.

b) Passwords of length 3, 4, or 5 that may have numerals or symbols and have no repeated characters.

c) Passwords of length 3, 4, or 5 that may not start with a numeral and have no repeated characters.

Explain your work.

Answer 1