Question 645487
A mall has 3 department stores, JC Penny's, Macy's, and Sears. 
A survey of 2,631 people exiting the mall found that 
432 made a purchase at JC Penny's, 
291 made a purchase at Macy's, 
517 made a purchase at Sears, 
83 made a purchase at JC Penny's and Macy's, 
207 made a purchase at JC Penny and Sears, 
126 of them made a purchase at Macy's and Sears, 
and 45 of them made a purchase at all 3 stores.
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A.  How many people made a purchase at JC Penney but did not make a purchase at Sears?
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B.  How many people made a purchase at exactly one of the three stores?
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If you construct a Venn Diagram you will be able to answer question a and b.
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Cheers,
Stan H.