Q. Forty students watched films A, B and C over a week. Each student watched either only one film or all three. Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C. How many students watched all three films?
(A) 0 (B) 2 (C) 4 (D) 8
Ans: 4
Sol:
Total students=40
13−x+16−x+19−x+x=40
Students watched all three movies
x=4
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