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?
Answer (1)
6th Jan, 2020
4 students are there who watched all the three films because if 4 students watched all the three then 9, 12 and 15 students are there who watched film only A , only B and only C respectively.
The total gives you a sum of forty i.e., 5+9+12+15 = 40.
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