The Star TV agency has conducted a survey in Green view residency to see how many people like these three serials: "Anupama" "Kalayani", and "Imlie" which hold first three positions of TRP. In a group of 150 people 90, 70, and 50 people like "Kalayani", "Imlie" and "Anupama" respectively. The number of people who like all the three serials is half the number of people who like exactly two serials. The number of people who like exactly any two out of the three serials is the same as those who like exactly any other two of the three serials. The number of people who like all the three serials are: