# Name Date. Goal: Understand and represent the intersection and union of two sets.

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1 F Math Intersection and Union of Two Sets p. 162 Name Date Goal: Understand and represent the intersection and union of two sets. A. intersection: The set of elements that are common to two or more sets. In set notation, A B denotes the intersection of sets A and B; for example, if A = {1, 2, 3} and B = {3, 4, 5}, then A B = {3}. B. union: The set of all the elements in two or more sets; in set notation, A B denotes the union of sets A and B; for example, if A = {1, 2, 3} and B = {3, 4, 5}, then A B = {1, 2, 3, 4, 5}. C. Principle of Inclusion and Exclusion: The number of elements in the union of two sets is equal to the sum of the number of elements in each set, less the number of elements in both sets; using set notation, this is written as n(a B) = n(a) + n(b) - n(a B).

2 INVESTIGATE the Math Jacquie is a zookeeper. She is responsible for feeding any baby animal that cannot be fed by its mother. She needs to feed a baby raccoon every 2 h and a baby lemur every 3 h. She uses the 24-hour clock to plan their feeding times. She starts to feed the raccoon at 02:00 and the lemur at 03:00. At what times will Jacquie need help to feed the raccoon and the lemur? A. Let set T represent all the hourly times from 01:00 to 24:00. Let set R represent times for every 2 h, up to 24 h. Let set L represent times for every 3 h, up to 24 h. Describe the universal set T and the subsets R and L in set notation. B. List the elements in each subset.

3 C. Represent the sets T, R, and L using a Venn diagram. Place the feeding times in the correct regions. Explain why you placed the sets and elements where you did. D. List the elements in the intersection of sets R and L, R L. E. List the elements in set R \ L (raccoon minus lemur) and in set L \ R (lemur minus raccoon) using set notation.

4 F. The set of times that belong to either a feeding schedule of every 2 h or a feeding schedule of every 3 h forms the union of sets R and L, or R L. List the elements in R L using set notation. G. List the elements in (R L), the complement of the union of R and L. Include these elements in your Venn diagram. H. Complete each statement with and or or. The set R L consists of the elements in set R L. The set R L consists of the elements in set R L. I. How does your Venn diagram show the times when Jacquie will need help to feed the two baby animals? J. Explain whether you agree or disagree with the following statement: The union of any two sets is like the addition of two numbers, so n(r L) = n(r) + n(l). If you disagree with this statement, write the correct formula for n(r L).

5 Example 1: Determining the union and intersection of disjoint sets (p.164) If you draw a card at random from a standard deck of cards, you will draw a card from one of four suits: clubs (C), spades (S), hearts (H), or diamonds (D). a) Describe sets C, S, H, and D, and the universal set U for this situation. b) Determine n(c ), n(s ), n(h ), n(d), and n(u ). c) Describe the union of S and H. Determine n(s H ).

6 d) Describe the intersection of S and H. Determine n(s H). e) Determine whether the events that are described by sets S and H are mutually exclusive, and whether sets S and H are disjoint. f) Describe the complement of S H.

7 Example 2: Determining the number of elements in a set using a formula (p. 166) The athletics department at a large high school offers 16 different sports: badminton basketball cross-country running curling football golf hockey lacrosse rugby cross-country skiing soccer softball tennis ultimate volleyball wrestling Determine the number of sports that require the following types of equipment: a) a ball and an implement, such as a stick, a club, or a racquet b) only a ball c) an implement but not a ball

8 d) either a ball or an implement e) neither a ball nor an implement Example 3: Determining the number of elements in a set by reasoning (p. 168) Jamaal surveyed 34 people at his gym. He learned that 16 people do weight training three times a week, 21 people do cardio training three times a week, and 6 people train fewer than three times a week. How can Jamaal interpret his results?

9 Example 4: Correcting errors in Venn diagrams (p.169) Morgan surveyed the 30 students in her mathematics class about their eating habits. 18 of these students eat breakfast. 5 of the 18 students also eat a healthy lunch. 3 students do not eat breakfast and do not eat a healthy lunch. How many students eat a healthy lunch? Tyler solved this problem, as shown below, but made an error. What error did Tyler make? Determine the correct solution. Tyler s Solution Let C represent the universal set, the students in Morgan s mathematics class. Let B represent those who eat breakfast, and let L represent those who eat a healthy lunch. There are 30 students in total. I drew a Venn diagram showing the number of elements in each region There are 18 students in set B. I put the 5 students who are in sets B and L in the overlap. There are 3 students who do not belong in either circle. This means there are 30-3 or 27 people in the coloured regions x = 27 x = 4 I determined the total number of elements in set L. n(l) = n(l) = 9 Therefore, 9 students eat a healthy lunch.

10

11 HW: 3.3 p #5, 6, 7, 9, 10, 11, 12, 16, 17 & 18

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