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Mathematics, 30.01.2020 07:50 KillerSteamcar

Anumber is called a "decreasing number" if each digit in the number is less than the digit to its left. for example, 87420 is a decreasing number. how many five-digit decreasing numbers are there?

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Anumber is called a "decreasing number" if each digit in the number is less than the digit to its le...

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