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10 cards from this deck
Visual tool showing sets and relationships using circles
Rectangle containing all possible elements
Intersection - elements in both sets
Union - elements in either set or both
Complement - elements not in A but in universal set
Number of elements it contains
∣A∪B∣=∣A∣+∣B∣−∣A∩B∣|A \cup B| = |A| + |B| - |A \cap B|∣A∪B∣=∣A∣+∣B∣−∣A∩B∣
To avoid double-counting shared elements
AND - element must be in both sets
OR - element in either set or both
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