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  3. 12 in a certain state license plates have six characters...

Question: 12 in a certain state license plates have six characters...

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12. In a certain state, license plates have six characters that may include letters and numerals. How many different license plates can be produced if: a letters and numerals can be repeated? b each letter and numeral can be used at most once? c the license plate must have a letter as its first character and each letter or numeral can be used at most once?

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