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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Question : How many biosphere reserves are there in India as of October 2022?
Option 1: Sixteen
Option 2: Eighteen
Option 3: Nineteen
Option 4: Seventeen
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