Venn Diagrams are essential for CAT, appearing in both Quant (Set Theory) and DILR (Caselets). This guide covers the core formulas for 2 and 3 sets, plus the visual strategies needed to solve complex maximization/minimization problems without algebra.
Start with the fundamental definitions of sets. Understand the difference between 'Union' (OR) and 'Intersection' (AND) to decode word problems correctly.
Master the formula for two sets. Learn why we subtract the intersection to avoid the 'double-counting trap' common in CAT Arithmetic.
Extend the logic to three sets. Understand the critical step of adding back the central intersection, a key concept for DILR caselets.
Move beyond formulas. Learn to map data into the four distinct regions of a Venn diagram to solve problems faster and with fewer errors.
Level up to the 8-region diagram. This visual tool is indispensable for solving complex 3-variable DILR sets involving 'Only A', 'Only B', etc.
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