Question: Suppose a 6-character password needs to be made using any of the letters A, X, Q, F, R, P and odd numbers between 0-10. How

Suppose a 6-character password needs to be made using any of the letters A, X, Q, F, R, P and odd numbers between 0-10. How many passwords exist if: a) any combination of these characters is allowed, and characters can be repeated b)repetition is not allowed c)alternate characters need to be letters or numbers, and repetition is not allowed

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