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Chance of winning Unit 6 Probability
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Chance of winning Unit 6 Probability. Multiplication Property of Counting If one event can occur in m ways and another event can occur in n ways, then.

Jan 19, 2018

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Georgia Osborne

Example 1  At a sporting good store, skateboards are available in 8 different deck designs. Each deck design is available with 4 different wheel assemblies. How many skateboard choices does the store offer?
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Page 1: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Chance of winningUnit 6 Probability

Page 2: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Multiplication Property of Counting If one event can occur in m ways and

another event can occur in n ways, then the number of ways that both events can occur together is m·n. The principle can be extended to three or more events

Page 3: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example 1 At a sporting good store, skateboards are

available in 8 different deck designs. Each deck design is available with 4 different wheel assemblies. How many skateboard choices does the store offer?

Page 4: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Addition Counting Principle If the possibilities being counted can be

divided into groups with no possibilities in common, then the total number of possibilities is the sum of the numbers of possibilities in each group.

Page 5: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example 2 Every purchase made on a company’s

website is given a random generated confirmation code. The code consists of 4 symbols (letters and digits). How many codes can be generated if at least one letter is used in each.

Page 6: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Finding Probabilities Using Permutations

6.2 pg. 342

Page 7: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Vocabulary Factorials- for any positive integer n, the

product of the integers from 1 to n is called n factorial and is written n!. Except 0! Which is equal to 1.

Page 8: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Examples 1. 6! = 6•5•4•3•2•1 = 720

Find: 2. 10! 3. 8!

Page 9: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Vocab. Permutations- an arrangement of objects in which

order is IMPORTANT. The number of permutations of n objects is given by !n n n

Page 10: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Permutations The number of permutations of n objects

taken r at a time, where r ≤ n, is given by:

Used for the arrangement of objects in a specific order.

!( )!n rnn r

Page 11: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Examples

4. There are 5 students in the front row. How many ways can I call on each of them to present one of 5 problems on the board?

1st 2nd 3rd 4th 5th

5 4 3 2 1So, I have 5•4•3•2•1 = 120 ways to call on

them. 5 things taken 5 at a time… 5P5

Page 12: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example

5. What if we were choosing 5 people from the entire class?

1st 2nd 3rd 4th 5th

30 29 28 27 26

So there are 17, 100, 720 ways to choose 5.

30 530! 30 29 28 27 26 25 ...

(30 5)! 25 24 ...

Page 13: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example6. A 3-digit number is formed by selecting

from the digits 4, 5, 6, 7, 8, and 9. There is no repetition. How many numbers are formed?

Page 14: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example7. How many of the numbers from Example

6 will be greater than 800?

Page 15: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example8. How many 3 digit numbers can be

formed using the digits 1, 2, 3, 4 and 5, if repetition is allowed?

Page 16: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example9. How many different 4 letter words can be

formed from the word CALM? (Assume any combo of 4 is a real word)

10. How many different 4 letter words can be formed from the word LULL? (Assume any combo of 4 is a real word)

What’s the difference in 9 and 10?

Page 17: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

PermutationsThe number of permutations of n things,

taken n at a time, with r of those things identical is:

11. How many different 4 letter words can be formed from the word BABY?

!!nr

Page 18: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

HomeworkText book Pg. 344

2-26 even

Page 19: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

CombinationsSection 6.3

Page 20: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Definition A Combination is a selection of objects in

which order is NOT important. The number of combination of n objects taken r at a time, where

n

, is given by!

! !r

r nnC

r n r

Page 21: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example How many combinations of 3 letters from

a list of A, B, C, D are there?

Page 22: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example For your school pictures, you can choose 4

backgrounds from a list of 10. How many combinations of backdrops are possible?

Page 23: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Example Five students from the 90 students in your

class will be selected to answer a questionnaire about participating in school sports. How many groups of 5 students are possible?

Page 24: Chance of winning Unit 6 Probability. Multiplication Property of Counting  If one event can occur in m ways and another event can occur in n ways, then.

Homework Page 349 Numbers 2 -20 even