Mathematics
Mathematics, 27.01.2022 02:00, Geo777

A zip-code is any 5-digit number, where each digit is an integer 0 through 9. For example, 92122 and 00877 are both zip-codes. How many zip-codes have exactly 4 different digits

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A zip-code is any 5-digit number, where each digit is an integer 0 through 9. For example, 92122 and...

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