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10 cards from this deck
Collection of distinct objects or elements
Using curly brackets { }
Number of elements in a set
n(A)n(A)n(A) or ∣A∣|A|∣A∣
Set with no elements
∅\varnothing∅ or {}\{\}{}
Every element of BBB is in AAA
BBB subset of AAA with strictly fewer elements
Elements in universal set UUU not in AAA
Complete collection of all elements under consideration
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