A middle school​ counselor, attempting to correlate school performance with leisure​ interests, found that of a group of​ students, 33 had seen Movie​ A, 29 had seen Movie​ B, 23 had seen Movie​ C, 15 had seen Movies A and​ B, 10 had seen Movies A and​ C, 9 had seen Movies B and​ C, 3 had seen all three​ films, and 5 had seen none of the three films