How many license plates,each of which contains three letters followed by three digits, can be formed if the first digit used cannot be and if the first digit used cannot be O? Assume that repetition of letters and digits is allowed.
How many license plates,each of which contains three letters followed by three digits, can be formed if the letters A,E,I,O,and U cannot be and if the first digit used cannot be O? Assume that repetition of letters and digits is allowed.
