(i) In a survey of 100 students it was found that 50 used the college library, 40 had their own and 30 borrowed books, 20 used both college library and their own, 15 borrowed books and used their own books, whereas 10 used borrowed books and college library. Assuming that all students use either college library books or their own or borrowed books. find the number of students using all the three sources.
(i) In a survey of 100 students it was found that 50 used the college library, 40 had their own and 30 borrowed books, 20 used both college library and their own, 15 borrowed books and used their own books, whereas 10 used borrowed books and college library. Assuming that all students use either college library books or their own or borrowed books. find the number of students using all the three sources.
(ii) If the number of students using no book at all is 10, and the number of students using all the three is 20. Show that the information is inconsistent.