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A licence plate consists of seven symbols: digits or letters. How many licence plates are there if the following is true: (1) there must be

A licence plate consists of seven symbols: digits or letters. How many licence plates are there if the following is true: (1) there must be three letters and four digits, and symbols may repeat? (2) no restrictions on the quantity of letters and numbers, and symbols may repeat?
Problem 1. A licence plate consists of seven symbols: digits or letters. How many licence plates are there if the following is true: (1) there must be three letters and four digits, and symbols may repeat? (2) no restrictions on the quantity of letters and numbers, and symbols may repeat

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