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Counting password possibilities. Jump to level 1 Each character in a password is either a digit [0-9] or lowercase letter [az]. How many valid passwords

Counting password possibilities. Jump to level 1 Each character in a password is either a digit [0-9] or lowercase letter [az]. How many valid passwords are there with the given restriction(s)? Length is 15 and cannot start nor end with a digit. EX: 26 * 36A21 I Write ab as: a"b

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