hard · GRE Quant
In an environmental monitoring project, 49 participants are classified into groups music, theater, dance. The three group totals are 22, 21, and 21; the pairwise intersections are 7, 7, and 10, respectively; and 3 participants are in all three groups. Pairwise counts include those in all three. How many belong to exactly two groups?
- 3
- 24
- 64
- 15
- 40
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