ACT Preparation / Unit 15 ACT 1429 short lesson, about 20 seconds
The Multiplication Principle
Captions available
The idea
If one choice can be made in m ways and a second in n ways, the two together can be made in m × n ways.
In practice
4 shirts and 3 pairs of pants make 12 outfits; adding 2 pairs of shoes makes 24.
Where people slip
The principle multiplies choices made together; choices made instead of each other add.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
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