In a survey of 44 shoppers at a mall, 21 bought clothes, 21 bought shoes and 12 bought both. How many shoppers are in exactly one of the two groups?

  1. 30
  2. 9
  3. 18
  4. 14
Answer

C) 18

At least one = 21 + 21 - 12 = 30; first group only = 9; second group only = 9; exactly one = 18; neither = 44 - 30 = 14. So the answer is 18. SLO M-09-A-14 · Application

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