Set Theory in Probability
Set theory provides the formal language for probability, where the sample space S is represented as a set, events as subsets, and operations like union (A ∪ B), intersection (A ∩ B), and complement (A') describe combined and complementary events.
Real World
Google's ad targeting team uses set intersection to identify users who are in both the 'searched for trainers' group and the 'visited a sports retailer' group for precision campaigns.
Exam Focus
Use correct set notation (∪, ∩, A') throughout; misusing 'and'/'or' informally in working can cost communication marks.
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