Many states offer personalized license plates. The state of California, for example, allows personalized plates with seven

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Many states offer personalized license plates. The state of California, for example, allows personalized plates with seven spaces for numerals or letters, or one of the following four symbols:

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What is the total number of license plates possible using this counting scheme? (Assume that each available space is occupied by a numeral, letter, symbol, or space.)

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