in a survey of80 pepple it was found that 25 reads dainik jagran 26 reads amar ujala , 26 reads hindustan times 9 read both dainik jagran , and amar ujala , 11 read amar ujala and hindustan times , 8 reads hindustan times and dainik jagran , 3 real all three news paper find. Q1. None of them
Q2. atleast one news paper 

Q3. exactly one newspaper