Page 169 - Math Course 1 (Book 2)

Fundamental Counting Principle

Mo. 11

Lesson 6 Key Concept

Fundamental Counting Principle
KEY CONCEPTS:
1. Use tree diagrams or the Fundamental Words If event M can occur in m outcomes
Counting Principle to count outcomes. and is followed by event N that can
2. Probability: Fundamental Counting occur in n outcomes, then the event
Principle M followed by N can occur in m • n
outcomes.

Example If there are 5 possible deck and 3
possible sets of wheels, then there
MO. 11 - L6a are 5 • 3 or 15 possible skateboards.

Counting Outcomes: My New Car

Fundamental Counting Principle

Vocabulary A-Z
Let us learn some vocabulary
GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL GL SS SL
You can count the choices, or just do the simple calculation:
Total Choices = 2 x 5 x 3 = 30

tree diagram
diagram used to represent the possible outcomes. Let’s Begin

Use a Tree Diagram to Count Outcomes

Example

GREETING CARDS

A greeting card maker offers three birthday
greetings in four possible colors, as shown below.
Draw a tree diagram to f nd the number of cards
that can be made from three greeting choices and
fundamental counting principle four color choices?
The fundamental counting principle relates the
number of outcomes to the number of choices. Greeting Color

the Humorous Blue
the
The number the number
number of number of
of types lengths of types possible Traditional Green
of boots times of skis times of poles equals outcomes
Romantic Orange
4 x 5 x 2 = 40
Red

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