2023 AMC 12A Problem 7


A digital display shows the current date as an 88 -digit integer consisting of a 44 -digit year, followed by a 22 -digit month, followed by a 22 -digit date within the month. For example, Arbor Day this year is displayed as 2023042820230428 . For how many dates in 20232023 will each digit appear an even number of times in the 8-digital display for that date?

(A) 5(B) 6(C) 7(D) 8(E) 9\textbf{(A)}~5\qquad\textbf{(B)}~6\qquad\textbf{(C)}~7\qquad\textbf{(D)}~8\qquad\textbf{(E)}~9


Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.

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Problem Tags: Counting and probability

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Category: AMC 12A
Points: 2
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