Lesson 9-3 Pages 378-380

The Fundamental Counting Principle

Lesson Check 9-2

What you will learn!

How to use multiplication to count outcomes.

Fundamental counting principalFundamental counting principal

What you really need to know!

If event M can occur in m ways and is followed by event N that can occur in n ways, then the event M followed by N can occur in m • n ways. This is called the Fundamental Counting Principle.

What you really need to know!

Choices x Choices = Number of outcomes

Link to Pre-Made Lesson

Example 1:

The table on the next slide shows the shirts, shorts and shoes in John’s wardrobe. How many possible outfits can he choose consisting of one shirt, one pair of shorts, and one pair of shoes?

ShirtsShirts ShortsShorts ShoesShoes

redred

blueblue

whitewhite

yellowyellow

beigebeige

greengreen

blueblue

blackblack

brownbrown

4 x 3 x 2 = 24

Example 2:

An orchestra has one opening for a violinist, one opening for a cellist, and one opening for a oboist. Three musicians are trying out for violin, five for cello, and three for oboe. Find the number of ways the openings can be filled.

AA 99 BB 1111 CC 1515 DD 4545

3 x 5 x 3 = 45

AA 99 BB 1111 CC 1515 DD 4545

Page 379

Guided Practice

#’s 5-8

Pages 378-379 with someone at home and study

examples!

Read:

Homework: Page 380

#’s 9-16 all

#’s 21-26

Lesson Check 9-3

Link to 9-3 Review Problems

Page

585

Lesson 9-3

Lesson Check 9-3