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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

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