medium · GMAT Quant
Rook Foundry has 48 lots: 21 in X, 20 in Y, 16 in Z. Pairwise overlaps (including the triple) are 6, 6, and 5, and 3 are in all three. An unused fourth group is named in a footnote.
How many are in none of the three groups?
- 43
- 57
- 3
- 48
- 5
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