in a survey of 60 students, it was found that 25 students stick to the internet. 26 students remain busy with thir mobile and 26 students prefer to read extra books. 9 students prefer to sorrt internetand remain busy with their mobile, 11 students prefer to sort internet and remain busy with their mobile, 8 students prefer to remain busy with their mobile and read extra books and 3 students are engaged in all the three activities.
1) how many students sort internet only?

let no.of student prefer to Internet be A mobile be B n extra books be C 
no of students who use only Internet =  n(A) - (n(A∩ B) + n(A ∩ C) -n(A∩ B ∩ C)
                                                         
                                                             = 25 - ( 9 + 11 - 3 ) = 25 - 17 = 8
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Thank you so much Sak...... for answering my query.
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m pleasure :)
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