Question: 4. (15 points) Consider the characters $, @, ?, !., &, % and *. (a) How many different strings of characters of length five can

4. (15 points) Consider the characters $, @, ?, !., &, % and *. (a) How many different strings of characters of length five can be formed with the symbols above? (b) How many different strings of characters of length five can be formed with the symbols above if all characters are supposed to be different? (c) How many different strings of characters of length five can be formed with the symbols above if $ must appear at least two times in the string

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