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Answer each question based only on what was presented in the video lesson on set theory (Section 1.4). No outside knowledge is needed — every answer can be found in the video.
Apply what you learned about set operations — intersection, union, disjoint sets, set difference, and cardinality — by working through these problems. Show all work and calculations.
This lesson explores the core set operations covered in Section 1.4 of Contemporary Mathematics: intersection, union, disjoint sets, and cardinality. Using relatable examples — from the blended family in the 1968 film *Yours, Mine, and Ours* to a Juneteenth dessert party — the discussion unpacks how these operations work and why they matter. You'll also discover the surprising history of the Venn diagram and how set theory powers the technology you use every day. In this video: • Intersection vs. union explained through the blended family in the movie Yours, Mine, and Ours, with Joseph as the shared element counted only once • Disjoint sets and the empty set illustrated by the scenario of two friend groups at a party who share no common members • The logical AND (intersection) demonstrated with the driver's license written test and road test requirement • The inclusive OR (union) explored through a birthday party dessert example with cake, ice cream, and the double-dipper Lenny • The collaborative history of Venn diagrams — from Euler's circles to John Venn's shading to Lewis Carroll's enclosing universal set rectangle • The cardinality formula n(A∪B) = n(A) + n(B) − n(A∩B) applied to Don Woods's Juneteenth celebration guest list • The Sets Challenge app and the concept of set difference (A − B), showing how mathematical notation adapts across different media #OpenStax #SetTheory #ContemporaryMathematics #VennDiagram #Math OpenStax Content adapted from "Contemporary Math", by OpenStax Licensed under CC BY 4.0. Content based on Web Version: Apr 23, 2026. Read the textbook online https://openstax.org/details/books/contemporary-mathematics Music first girl talking to me. by ikkun (ex. Barradeen) | https://soundcloud.com/ikkunwastaken Royalty Free Music by https://www.free-stock-music.com Creative Commons / Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en_US
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