Dominoes A domino is a flat rectangular block the face of which is divided into two

Zip Codes How many 5-digit zip codes are possible if digits can be repeated? If there cannot be repetitions?

Batting Order How many ways can a baseball manager arrange a batting order of 9 players?

Video Games How many different ways can 7 different video game cartridges be arranged on a shelf?

Seating Arrangements In how many ways can 5 speakers be seated in a row on a stage?

Shampoo Display A store manager wishes to display 8 different brands of shampoo in a row. How many ways can this be done?

Show Programs Three bands and two comics are performing for a student talent show. How many different programs (in terms of order) can be arranged? How many if the comics must perform between bands?

Campus Tours Student volunteers take visitors on a tour of 7 campus buildings. How many different tours are possible? (Assume order is important.)

Radio Station Call Letters The call letters of a radio station must have 4 letters. The first letter must be a K or a W. How many different station call letters can be made if repetitions are not allowed? If repetitions are allowed?

Identification Tags How many different 3-digit identification tags can be made if the digits can be used more than once? If the first digit must be a 5 and repetitions are not permitted?

Book Arrangements A reference encyclopedia has 12 volumes. Disregarding alphabetical or numerical order, in how many ways can the books be arranged on a shelf?

Selection of Officers Six students are running for the positions of president and vice-president, and five students are running for secretary and treasurer. If the two highest vote getters in each of the two contests are elected, how many winning combinations can there be?

Automobile Trips There are 2 major roads from city X to city Y and 4 major roads from city Y to city Z. How many different trips can be made from city X to city Z passing through city Y?

Evaluate each of these. a. 8! e. 7P5 i. 5P5 b. 10! f. 12P4 j. 6P2 c. 0! g. 5P3 d. 1! h. 6P0

County Assessments The County Assessment Bureau decides to reassess homes in 8 different areas. How many different ways can this be accomplished?

Sports Car Stripes How many different 4-color code stripes can be made on a sports car if each code consists of the colors green, red, blue, and white? All colors are used only once.

Manufacturing Tests An inspector must select 3 tests to perform in a certain order on a manufactured part. He has a choice of 7 tests. How many ways can he perform 3 different tests?

Threatened Species of Reptiles There are 22 threatened species of reptiles in the United States. In how many ways can you choose 4 to write about? (Order is not important.)

Inspecting Restaurants How many different ways can a city health department inspector visit 5 restaurants in a city with 10 restaurants?

How many different 4-letter permutations can be formed from the letters in the word decagon?

Cell Phone Models A particular cell phone company offers 4 models of phones, each in 6 different colors and each available with any one of 5 calling plans. How many combinations are possible?

ID Cards How many different ID cards can be made if there are 6 digits on a card and no digit can be used more than once?

Free-Sample Requests An online coupon service has 13 offers for free samples. How may different requests are possible if a customer must request exactly 3 free samples? How many are possible if the customer may request up to 3 free samples?

Ticket Selection How many different ways can 4 tickets be selected from 50 tickets if each ticket wins a different prize?

Movie Selections The Foreign Language Club is showing a four-movie marathon of subtitled movies. How many ways can they choose 4 from the 11 available?

Task Assignments How many ways can an adviser choose 4 students from a class of 12 if they are all assigned the same task? How many ways can the students be chosen if they are each given a different task?

Agency Cases An investigative agency has 7 cases and 5 agents. How many different ways can the cases be assigned if only 1 case is assigned to each agent?

Evaluate each expression. a. 5C2 d. 6C2 g. 3C3 j. 4C3 b. 8C3 e. 6C4 h. 9C7 c. 7C4 f. 3C0 i. 12C2

Selecting Cards How many ways can 3 cards be selected from a standard deck of 52 cards, disregarding the order of selection?

Selecting Bracelets How many ways are there to select 3 bracelets from a box of 10 bracelets, disregarding the order of selection?

Selecting Players How many ways can 4 baseball players and 3 basketball players be selected from 12 baseball players and 9 basketball players?

Selecting a Committee How many ways can a committee of 4 people be selected from a group of 10 people?

Selecting Christmas Presents If a person can select 3 presents from 10 presents under a Christmas tree, how many different combinations are there?

Questions for a Test How many different tests can be made from a test bank of 20 questions if the test consists of 5 questions?

Promotional Program The general manager of a fast-food restaurant chain must select 6 restaurants from 11 for a promotional program. How many different possible ways can this selection be done?

Music Program Selections A jazz band has prepared 18 selections for a concert tour. At each stop they will perform 10. How many different programs are possible? How many programs are possible if they always begin with the same song and end with the same song?

Freight Train Cars In a train yard there are 4 tank cars, 12 boxcars, and 7 flatcars. How many ways can a train be made up consisting of 2 tank cars, 5 boxcars, and 3 flatcars? (In this case, order is not important.)

Selecting a Committee There are 7 women and 5 men in a department. How many ways can a committee of 4 people be selected? How many ways can this committee be selected if there must be 2 men and 2 women on the committee? How many ways can this committee be selected if there must be at least 2 women on the committee?

Selecting Cereal Boxes Wake Up cereal comes in 2 types, crispy and crunchy. If a researcher has 10 boxes of each, how many ways can she select 3 boxes of each for a quality control test?

Hawaiian Words The Hawaiian alphabet consists of 7 consonants and 5 vowels. How many three-letter words are possible if there are never two consonants together and if a word must always end in a vowel?

Selecting a Jury How many ways can a jury of 6 women and 6 men be selected from 10 women and 12 men?

Selecting a Golf Foursome How many ways can a foursome of 2 men and 2 women be selected from 10 men and 12 women in a golf club?

Investigative Team The state narcotics bureau must form a 5-member investigative team. If it has 25 agents from which to choose, how many different possible teams can be formed?

Dominoes A domino is a flat rectangular block the face of which is divided into two square parts, each part showing from zero to six pips (or dots). Playing a game consists of playing dominoes with a matching number of pips. Explain why there are 28 dominoes in a complete set.

Charity Event Participants There are 16 seniors and 15 juniors in a particular social organization. In how many ways can 4 seniors and 2 juniors be chosen to participate in a charity event?

Selecting Commercials How many ways can a person select 7 television commercials from 11 television commercials?

DVD Selection How many ways can a person select 8 DVDs from a display of 13 DVDs?

Candy Bar Selection How many ways can a person select 6 candy bars from a list of 10 and 6 salty snacks from a list of 12 to put in a vending machine?

Selecting a Location An advertising manager decides to have an ad campaign in which 8 special calculators will be hidden at various locations in a shopping mall. If he has 17 locations from which to pick, how many different possible combinations can he choose?

Selecting Posters A buyer decides to stock 8 different posters. How many ways can she select these 8 if there are 20 from which to choose?

Test Marketing Products Anderson Research Company decides to test-market a product in 6 areas. How many different ways can 3 areas be selected in a certain order for the first test?

Selecting Rats How many different ways can a researcher select 5 rats from 20 rats and assign each to a different test?

Selecting Musicals How many different ways can a theatrical group select 2 musicals and 3 dramas from 11 musicals and 8 dramas to be presented during the year?

Textbook Selections How many different ways can an instructor select 2 textbooks from a possible 17?

Tape Selections How many ways can a person select 8 videotapes from 10 videotapes?

Public Service Announcements How many different ways can 5 public service announcements be run during 1 hour?

Signal Flags How many different signals can be made by using at least 3 different flags if there are 5 different flags from which to select?

Dinner Selections How many ways can a dinner patron select 3 appetizers and 2 vegetables if there are 6 appetizers and 5 vegetables on the menu?

Air Pollution The Environmental Protection Agency must investigate 9 mills for complaints of air pollution. How many different ways can a representative select 5 of these to investigate this week?

Selecting Officers In a board of directors composed of 8 people, how many ways can one chief executive officer, one director, and one treasurer be selected?

Selecting Coins How many different ways can you select one or more coins if you have 2 nickels, 1 dime, and 1 half-dollar?

People Seated in a Circle In how many ways can 3 people be seated in a circle? 4? n? (Hint: Think of them standing in a line before they sit down and/or draw diagrams.)

Seating in a Movie Theater How many different ways can 5 peopleA, B, C, D, and Esit in a row at a movie theater if (a)Aand B must sit together; (b) C must sit to the right of, but not necessarily next to, B; (c) D and E will not sit next to each other?

Poker Hands Using combinations, calculate the number of each poker hand in a deck of cards. (A poker hand consists of 5 cards dealt in any order.) a. Royal flush c. Four of a kind b. Straight flush d. Full house