Counting Principles

For the following exercises, determine whether to use the Addition Principle or the Multiplication Principle. Then perform the calculations.

1. Let the set [latex]B={-23,-16,-7,-2,20,36,48,72}[/latex]. How many ways are there to choose a positive or an odd number from [latex]A[/latex]?
2. How many ways are there to pick a paint color from [latex]5[/latex] shades of green, [latex]4[/latex] shades of blue, or [latex]7[/latex] shades of yellow?
3. How many outcomes are possible from tossing a coin and rolling a 6-sided die?
4. How many ways are there to construct a string of [latex]3[/latex] digits if numbers can be repeated?

For the following exercises, compute the value of the expression.

5. [latex]P(5,2)[/latex]
6. [latex]P(3,3)[/latex]
7. [latex]P(11,5)[/latex]
8. [latex]C(12,4)[/latex]
9. [latex]C(7,6)[/latex]

For the following exercises, find the number of subsets in each given set.

10. [latex]{1,2,3,4,5,6,7,8,9,10}[/latex]
11. A set containing 5 distinct numbers, 4 distinct letters, and 3 distinct symbols
12. The set of two-digit numbers between 1 and 100 containing the digit 0

For the following exercises, find the distinct number of arrangements.

13. The letters in the word “academia”
14. The symbols in the string #,#,#,@,@,$,$,$,%,%,%,%

Real-World Applications

15. A cell phone company offers [latex]6[/latex] different voice packages and [latex]8[/latex] different data packages. Of those, [latex]3[/latex] packages include both voice and data. How many ways are there to choose either voice or data, but not both?
16. A wholesale T-shirt company offers sizes small, medium, large, and extra-large in organic or non-organic cotton and colors white, black, gray, blue, and red. How many different T-shirts are there to choose from?
17. An art store has [latex]4[/latex] brands of paint pens in [latex]12[/latex] different colors and [latex]3[/latex] types of ink. How many paint pens are there to choose from?
18. How many ways can a baseball coach arrange the order of [latex]9[/latex] batters if there are [latex]15[/latex] players on the team?
19. A motorcycle shop has [latex]10[/latex] choppers, [latex]6[/latex] bobbers, and [latex]5[/latex] café racers—different types of vintage motorcycles. How many ways can the shop choose [latex]3[/latex] choppers, [latex]5[/latex] bobbers, and [latex]2[/latex] café racers for a weekend showcase?
20. Just-For-Kicks Sneaker Company offers an online customizing service. How many ways are there to design a custom pair of Just-For-Kicks sneakers if a customer can choose from a basic shoe up to [latex]11[/latex] customizable options?
21. Suni bought [latex]20[/latex] plants to arrange along the border of her garden. How many distinct arrangements can she make if the plants are comprised of [latex]6[/latex] tulips, [latex]6[/latex] roses, and [latex]8[/latex] daisies?

Binomial Theorem

For the following exercises, evaluate the binomial coefficient.

1. [latex]\begin{array}{c} 5 \\ 2 \end{array}[/latex]
2. [latex]\begin{array}{c} 7 \\ 4 \end{array}[/latex]
3. [latex]\begin{array}{c} 9 \\ 7 \end{array}[/latex]
4. [latex]\begin{array}{c} 11 \\ 6 \end{array}[/latex]

For the following exercises, use the Binomial Theorem to expand each binomial.

5. [latex](4a - b)^3[/latex]
6. [latex](3a + 2b)^3[/latex]
7. [latex](4x + 2y)^5[/latex]
8. [latex](4x - 3y)^5[/latex]
9. [latex](x^{-1} + 2y^{-1})^4[/latex]

For the following exercises, use the Binomial Theorem to write the first three terms of each binomial.

10. [latex](a + b)^{17}[/latex]
11. [latex](a - 2b)^{15}[/latex]
12. [latex](3a + b)^{20}[/latex]
13. [latex](x^3 - \sqrt{y})^8[/latex]

For the following exercises, find the indicated term of each binomial without fully expanding the binomial.

14. The fourth term of [latex](3x - 2y)^5[/latex]
15. The eighth term of [latex](7 + 5y)^{14}[/latex]
16. The fifth term of [latex](x - y)^7[/latex]
17. The ninth term of [latex](a - 3b^2)^{11}[/latex]
18. The eighth term of [latex]\left(\frac{y}{2} + \frac{2}{x}\right)^9[/latex]

Introduction to Probability

https://openstax.org/books/college-algebra-corequisite-support-2e/pages/9-7-probability – Odd 7-49; 57-59

For the following exercises, use the spinner shown below to find the probabilities indicated.

1. Landing on a vowel
2. Landing on purple or a vowel
3. Landing on green or blue
4. Not landing on yellow or a consonant

For the following exercises, two coins are tossed.

5. Find the probability of tossing two heads.
6. Find the probability of tossing at least one tail.

For the following exercises, four coins are tossed.

7. Find the probability of tossing exactly two heads.
8. Find the probability of tossing four heads or four tails.
9. Find the probability of tossing not all tails.
10. Find the probability of tossing either two heads or three heads.

For the following exercises, one card is drawn from a standard deck of 52 cards. Find the probability of drawing the following:

11. A two
12. Red six
13. A non-ace

For the following exercises, two dice are rolled, and the results are summed.

14. Construct a table showing the sample space of outcomes and sums.
15. Find the probability of rolling at least one four or a sum of [latex]8[/latex].
16. Find the probability of rolling a sum greater than or equal to [latex]15[/latex].
17. Find the probability of rolling a sum less than [latex]6[/latex]or greater than [latex]9[/latex].
18. Find the probability of rolling a sum of [latex]5[/latex] or [latex]6[/latex].

For the following exercises, a coin is tossed, and a card is pulled from a standard deck. Find the probability of the following:

19. A head on the coin or a club
20. A head on the coin or a face card

For the following exercises, use this scenario: a bag of M&Ms contains [latex]12[/latex] blue, [latex]6[/latex] brown, [latex]10[/latex] orange, [latex]8[/latex] yellow, [latex]8[/latex] red, and [latex]4[/latex] green M&Ms. Reaching into the bag, a person grabs [latex]5[/latex] M&Ms.

21. What is the probability of getting all blue M&Ms?
22. What is the probability of getting [latex]3[/latex]blue M&Ms?

Use this data for the exercises that follow: In 2020, there were roughly 331 million citizens in the United States, and about 55.8 million were elderly (aged 65 and over).

23. If you meet five U.S. citizens, what is the percent chance that exactly one is elderly? (Round to the nearest tenth of a percent.)
24. If you meet five U.S. citizens, what is the percent chance that four are elderly? (Round to the nearest thousandth of a percent.)