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Mathematics, 02.12.2021 20:20 yeehaw777

ZIP codes in a country consist of three numbers and two letters in alternating format-for example, 3G2 H8. a. How many possible ZIP codes are there if zero and the letter O cannot be used?
b. How many possible ZIP codes are there if zero and the letter O cannot be used and the first digit is 7 and the first letter is C?

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