A recent survey of w shoppers (that is, n(U) = w) yielded the following information: x shoppers shopped at Sears, y shopped at JCPenney’s, and z shopped at both. How many people shopped at the following?
a. Sears or JCPenney’s
b. only Sears
c. only JCPenney’s
d. neither Sears nor JCPenney’s
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