Question: Each character in a password is either a digit [0 - 9] or lowercase letter a - z . How many valid passwords are there

Each character in a password is either a digit [0 - 9] or lowercase letter a - z . How many valid passwords are there with the given restriction(S)? Length is 18. No character repeats. Ex: P(11, 4) * P(4, 3) Write permutations as: P(n, k)

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