1.5: Homework
- Page ID
- 70301
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- Start a new module on the front side of a new page and write the module number on the top center of the page.
- Answers without supporting work will receive no credit.
- Some solutions are given in the solutions manual.
- You may work with classmates but do your own work.
Let U = {a, c, e, m n, r, u, v, w, x, z} with subsets A, B, C and D defined below: A = {m, n, r, u, x} B = { a, c , r, u, x} C = {e, v, w, x, z } D = {a, c, z} Using correct notation, find the following, show all work
| a. \(\bf B \cap D\) | f. \(\bf A - C^{c}\) | k. \(\bf (A \cap D) - B^{c}\) |
| b. \(\bf A \cap D\) | g. \(\bf B - (A \cap C)\) | l. n(\(\bf A \cup B\)) |
| c. C - B | h. \(\bf D^{c} - (B \cup C)\) | m. n(A) + n(B) |
| d. \(\bf (A \cup C)^{c}\) | i. \(\bf (A \cap B) \cap (C \cup D)\) | n. n(D - C) |
| e. \(\bf D^{c} \cap B\) | j. \(\bf (B^{c} \cup D)^{c}\) | o. n(\(\bf B \cap C\)) |
Let U = {a, c, e, m n, r, u, v, w, x, z} with subsets A, B, C defined as follows:
| A = {m, n, r, u, v} | B = {r, u, w, x} | C = {n, r, x, c} |
Draw a Venn Diagram and place each element of the universe in the correct region
Use deMorgan's Laws to rewrite each of the following:
| a. \(\bf N \cup P^{c}\) | b. \(\bf R^{c} \cap S\) |
Use the distributive properties of sets to rewrite each of the following:
| a. \(\bf (A^{c} \cup E) \cap (A^{c} \cup F)\) | b. \(\bf B \cap (A \cup C)\) |
A survey was given to determine which of the three beverages (tea, milk and/or coffee) people drank each day. The results were as follows:
| 7 only drank coffee | 6 drank all three | 11 drank tea and coffee |
| 21 drank coffee | 4 drank none of the three | 9 drank neither coffee or tea |
| 21 drank tea | 1 drank only tea and milk |
| a. Draw a Venn diagram indicating how many people would belong in each region. Label the three sets with meaningful letters. |
| b. How many people were surveyed? |
| c. How many drank milk? |
| d. How many drank only coffee and milk? |
| e. How many drank only milk? |
| f. How many drank tea or coffee but not milk? |
| g. How many drank exactly two kinds of beverages? |
| h. How many didn’t drink milk or tea? |
Take out your A–blocks and arrange them into subsets so that each subset only contains elements that have the same size and color.
| a. How many subsets are there? | b. How many pieces are in each subset? |
Let A, B and C represent any sets. Answer True or False for the following statements. In order for a statement to be true, it must always be true. For each False statement, give an example of why it is False.
| a. B is always a subset of \(\bf A \cup B\) |
| b. \(\bf (A - B)^{c} = A^{c} - B^{c}\) |
| c. B is always a subset of \(\bf A \cap B\) |
| d. \(n\)(\(\bf A \cup B\)) = \(n\)(A) + \(n\)(B) |
| e. \(n\)(\(\bf A \cup B)\) = \(n\)(A) + \(n\)(B) – \(n\)(\(\bf A \cap B\)) |
| f. If \(n\)(\(\bf A \cup B\)) = \(n\)(A) + \(n\)(B), then A and B are disjoint. |
Draw a Venn diagram and shade in the region that represents the following
| a. \(\bf (C \cup A) - B\) | b. \(\bf (C \cap B) \cup A\) | c. \(\bf (C \cap B) - A\) |
| d. \(\bf (A \cup C) \cap B\) | e. \(\bf \bar{A} - (B \cap C)\) | f. \(\bf (B - A) \cap (B - C)\) |
Identify the shaded area of each Venn diagram by set notation.
 a. |
 b. |
List all possible subsets for each set given.
| a. { } | b. {a} | c. {a, b} | d. {a, b, c} |
Let A = {1, 2, 4}, B = {(a, c), 5} and C = {x}. Find the following:
| a. \(A \times A\) | a. \(A \times B\) | c. \(B \times C\) |
| d. \(C \times A\) | a. \(C \times C\) |
Use your A–blocks to do this problem. Let X represent the set of large circles and Y represent the set of red circles. Using set notation and abbreviations, find the following:
| a. X - Y | b. \(\bf X \cap Y\) | c. \(\bf X \cup Y\) | d. Y - X |