Lesson 8 of 20 · about 13 min
Inclusion–exclusion
When groups overlap, adding their sizes counts some things twice. Inclusion–exclusion fixes that with a simple add-subtract-add pattern. You'll use it on surveys and number puzzles, and see it on the Venn diagram from lesson 1.
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In this lesson you'll learn:
- Inclusion–exclusion (two sets)
- Inclusion–exclusion (three sets)
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