Mathematics, 05.12.2020 01:30 CoolRahim9090

Combinatorics problem! Decent amount of points How many 4-digit decimal numbers have at least a 7, an 8, and an 9? Not an 8,9, or 7, the 4 digit number must contain all 3 in it's digits. Some examples of such numbers are: 9871, 8279, and 5798. Repost cause of trolls...

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Combinatorics problem! Decent amount of points How many 4-digit decimal numbers have at least a 7,...

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