Formulas for Three Sets. If n = intersection and u = union. P (A u B u C) = P (A) + P (B) + P (C) – P (A n B) – P (A n C) – P (B n C) + P (A n B n C) For questions involving set theory, it may be helpful to make a Venn diagram to visualize the solution. [ KEEP STUDYING: Simple Quantitative Strategies for the GMAT ]
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