Question

In a survey of 90 students it was found that 35 liked to see TV. , 30 liked to use mobile phones,40 liked to use internet, 10 liked both TV and mobile phones, 15 liked both mobile and internet , 12 liked both TV and internet and 5 did not like any of these. Find i) How many liked all the three ii) How many liked atleast two of these .​

Answer 1

Answer:

45 liked atleast 2 of these and 15 like any three