Unit 3 · Counting

Chapter 3.2

Count What You Don't Want

Sometimes the things you want are hard to count, but the things you don't want are easy.

lesson 14 of 42

By the end

  1. 01Count the complement when 'at least' or 'not' makes the direct count messy
  2. 02Correct for overlapping groups with inclusion-exclusion on two or three sets

In unit 3

  1. 3.1Multiply or Add?
  2. 3.2Count What You Don't Want
  3. 3.3Arrangements and Overcounting
  4. 3.4Choosing, Pascal, and Stars and Bars
  5. 3.5Counting Two Ways
  6. 3.6Too Few Boxes
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