A survey of 100 college students who frequent the reading lo
A survey of 100 college students who frequent the reading lounge of a university revealed the following results: 40 read Time. 30 read The new Yorker. 25 read Vanity Fair. 15 read Time and The New Yorker. 12 read Time and Vanity Fair. 4 read all three magazines. How many of the students surveyed read: (a). At least one of these magazines? (b). Exactly one of these magazines? (c). Exactly two of these magazines? (d). None of these magazines