Question: 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

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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