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ILL 1987 Problem 9

    In the set of 2020 elements {1,2,3,4,5,6,7,8,9,0,A,B,C,D,J,K,L,U,X,Y,Z}\{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, A, B, C, D, J, K, L, U, X, Y , Z\} we have made a random sequence of 2828 throws. What is the probability that the sequence CUBA JULY 1987CUBA \ JULY \ 1987 appears in this order in the sequence already thrown?

    Dataset text AI-MO AoPS. Quoted with source.

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