hard · GRE Quant
In a library circulation study, 53 participants are classified into groups fiction, history, science. The three group totals are 18, 22, and 22; the pairwise intersections are 6, 6, and 9, respectively; and 3 participants are in all three groups. Pairwise counts include those in all three. How many belong to none of the three groups?
- 3
- 9
- 21
- 62
- 41
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