Over Lesson 13–8 A.A B.B C.C D.D 5-Minute Check 1 Find the number of possible outcomes if Lou has a choice of 4 sandwiches, 3 beverages and 2 desserts.

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Over Lesson 13–8 A.A B.B C.C D.D 5-Minute Check 1 Find the number of possible outcomes if Lou has a choice of 4 sandwiches, 3 beverages and 2 desserts. Find the number of possible outcomes if two number cubes labeled 1 to 6 are rolled.

Splash Screen

Then/Now You have already used tree diagrams or the Fundamental Counting Principle to find the probability of an event. (Lesson 13–8) Use permutations. Use combinations.

Vocabulary permutations combinations An arrangement or listing in which order is not important (example: toppings on a hamburger) An arrangement or listing in which order is important (example: lining students up in a line)

Example 1 Use a Permutation TRAVEL The Reyes family will visit a complex of theme parks during their summer vacation. They have a four-day pass good at one park per day. They can choose from seven parks. How many different ways can they arrange their vacation schedule? The order in which they visit the parks is important. This arrangement is a permutation. P(7, 4)= 7 ● 6 ● 5 ● 4 = choices for the 1 st day 6 choices for the 2 nd day 5 choices for the 3 rd day 4 choices for the 4 th day 7 parksChoose 4 Answer: There are 840 possible arrangements.

A.A B.B C.C D.D Example 1 A.10 B.30 C.60 D.120 TRACK AND FIELD How many ways can five runners be arranged on a three-person relay team?

Example 2 Use a Permutation How many six-digit numbers can be made from the digits 2, 3, 4, 5, 8, and 9 if each digit is used only once? Answer: 720 numbers P(6, 6)= 6 ● 5 ● 4 ● 3 ● 2 ● 1 = choices for the 1 st digit 5 choices for the 2 st digit 4 choices for the 3 nd digit 3 choices for the 4 rd digit 2 choices for the 5 th digit 1 choice remains for the 6 th digit

A.A B.B C.C D.D Example 2 A.6 B.720 C.5040 D.46,656 How many seven-digit numbers can be made from the digits 1, 2, 3, 4, 5, 6, and 7 if each digit is used only once?

Example 3 Use a Combination HATS How many ways can a window dresser choose two hats out of a fedora, a bowler, and a sombrero? Since order is not important, this arrangement is a combination. First, list all of the permutations of the types of hats taken two at a time. Then cross off arrangements that are the same as another one. FBFSBFBSSFSB FB and BF are not different in this case, so cross off one of them.

Example 3 Use a Combination There are only three different arrangements. Answer: There are three ways to choose two hats from three possible hats.

A.A B.B C.C D.D Example 3 A.4 B.6 C.12 D.24 SHIRTS How many ways can two shirts be selected from a display having a red shirt, a blue shirt, a green shirt, and a white shirt?

Example 4 Find Probability TENNIS The players listed are playing singles in a tennis tournament. If each player plays every other player once, what is the probability that Kyle plays in the first match? UnderstandThe order in which the players are selected is not important, so this is a combination. PlanFind the combination of 8 people taken 2 at a time. This will give you the number of matches that take place during the tournament. Then find how many of the matches involve Kyle.

Example 4 Find Probability CheckList all the 2-player matches in the tournament. Check to see that there are 28 matches. Solve There are 28 ways to choose 2 people. Kyle plays each person once during the tournament. If there are 7 other players, Kyle is involved in 7 matches. Answer:So, the probability that Kyle plays in the first match is or. ___ 7 28 __ 1 4

A.A B.B C.C D.D Example 4 VOLLEYBALL The teams listed are playing in a volleyball tournament. If each team plays every other team once, what is the probability that the Lions play in the first game? A. B. C. D.

End of the Lesson