Set Theory and Probability (Junior Cert Mathematics): Flashcards

A collection of things (called elements)

Union: all elements in either $A$, $B$, or both

Intersection: only elements in both $A$ and $B$

Complement: everything NOT in set $A$

Visual tool showing sets as circles; overlaps show intersections

Intersection: elements common to both sets

$A$ or $B$

$A$ and $B$

Organise information and make calculations easier

Everything in set $A$