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Sets and Set Operations. Objectives. Determine if a set is well defined. Write all the subsets of a given set and label the subsets as proper or improper. Given a universal set and some subsets, find a complement, intersection or union. Draw a Venn diagram to illustrate two sets.

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objectives
Objectives
  • Determine if a set is well defined.
  • Write all the subsets of a given set and label the subsets as proper or improper.
  • Given a universal set and some subsets, find a complement, intersection or union.
  • Draw a Venn diagram to illustrate two sets.
  • Use the cardinal number formula.
vocabulary
Vocabulary
  • roster notation
  • set-builder notation
  • well defined set
  • cardinal number
  • empty set
  • subset
  • proper/improper subset
  • intersection of sets
  • union of sets
  • mutually exclusive
  • complement of a set
set vocabulary
Set Vocabulary:

roster notation:

a complete or implied listing of all the elements of the set

set builder notation:

used when the roster method is cumbersome or impossible

set vocabulary1
Set Vocabulary:

well defined set:

A set is well-defined if any given object either is an element of the set, or is not an element of the set

determine if the given set is well defined
Determine if the given set is well defined.

The set of all good bands

The set of odd numbers

The set of small numbers

- not well defined

- well defined

- not well defined

given the sets u 0 1 2 3 4 5 6 7 8 9 a 0 2 4 5 6 8 and b 1 3 5 7 answer the questions below
Given the sets U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},A = {0, 2, 4, 5, 6, 8}, andB = {1, 3, 5, 7}Answer the questions below:
  • Find n(B).
  • Find the set A B.
  • Find the set

n(B) = 4

A  B = {5}

These are the things that are in set A and also in set B at the same time.

= {0, 2, 4, 6, 8, 9}

These are the things that are in set U (the universe for our problem) that are not in set B.

given the sets u 0 1 2 3 4 5 6 7 8 9 a 0 2 4 5 6 8 and b 1 3 5 7 answer the questions below1
Given the sets U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},A = {0, 2, 4, 5, 6, 8}, andB = {1, 3, 5, 7}Answer the questions below:
  • Find the set .
  • Is 7A true or false?
  • Is 5B true or false?
slide11

Formulas

Cardinal Number Formula for the Union of Sets

n(AB) = n(A) + n(B) — n(AB)

Cardinal Number Formula for the Complement of a Set

slide12

Suppose n(U) = 61, n(A) = 32, and n(B) = 26.

If n(AB) = 40, find n(AB) and draw a Venn diagram to illustrate the composition of U.

n(AB) = n(A) + n(B) — n(AB)

slide13

In a recent health survey, 750 single men in their twenties were asked to check the appropriate box or boxes on the following form.

I am a member of a private gym.

I am a vegetarian.

The results were tabulated as follows:

374 checked the gym box

92 checked the vegetarian box

332 were blank (no boxes checked)

slide14

750 men surveyed

374 checked the gym box

92 checked the vegetarian box

332 were blank (no boxes checked)

  • Draw a Venn diagram illustrating the results of the survey.
  • What percent of these men were both members of a private gym and vegetarians.
cards1
Cards

Determine how many cards, in an ordinary deck of 52, are clubs or twos.

cards2
Cards

Determine how many cards, in an ordinary deck of 52, are face cards or diamonds.

cards3
Cards

Determine how many cards, in an ordinary deck of 52, are threes or sixes.

cards4
Cards

Determine how many cards, in an ordinary deck of 52, are threes and sixes.