Lesson 5 of 20 · about 13 min
Counting: sum and product rules
How many passwords, outfits or license plates are possible? Two simple rules answer almost every counting question, without listing anything. You'll use them to see why long passwords beat clever ones, and count "at least one" by counting the opposite.
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In this lesson you'll learn:
- Product rule
- Sum rule
- Counting the complement
Free to try in F06 Discrete Math:
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