Mathematics, 30.11.2019 01:31 choiboiqg6811

How many elements are in the union of four sets if the sets have 50, 60, 70, and 80 elements, respectively, each pair of the sets has 5 elements in common, each triple of the sets has 1 common element, and no element is in all four sets

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How many elements are in the union of four sets if the sets have 50, 60, 70, and 80 elements, respec...