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Let the Sports Club be denoted by U, . F = Football . B = Basketball . V = Volleyball . n(U) = 110 . n(FnBnC') = 20 . n(FnVnB') = 15 . n(BnVnF') = 26 . n(FnBnV) = x . n(FnB'nV') = n(F'nBnV') = (F'nB'nV) = 2x . Note: B', F' and V' denote the complements of
