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- 17:42, 23 November 2015 (diff | hist) . . (+274) . . N 1971 IMO Problems/Problem 6 (Created page with "Let A = (aij), where i, j = 1, 2, ... , n, be a square matrix with all aij non-negative integers. For each i, j such that aij = 0, the sum of the elements in the ith row and t...")
