Chapter 3.5

Counting Two Ways

Name: Counting Two Ways
Description: If two different counts describe the same set, they must be equal, and that equation is often the whole solution.

If two different counts describe the same set, they must be equal, and that equation is often the whole solution.

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By the end

01Count one total two ways and set the counts equal
02Match a hard set one-to-one with an easy one

In unit 3

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