Iift 2010 Question 21
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IIFT 2010
Let the number of people who watched exactly one movie be 'a', the number of people who watched exactly two movies be 'b' and the
number of people who watched exactly three movies be 'c'
Then, a + b + c = 100 - 3 = 97 ...............(i)
also, a + 2b + 3c = 61 + 46 + 29 = 136.......................(ii)
On subtracting (i) from (ii), we get
b + 2c = 39
It is given that, b = 25
So, c = 7
Therefore, 7% people watched all the three movies.
Hence, option D is the correct answer.