Possible Classroom Examples:

• Is the given set well-defined?

• the set of all pink automobiles
• the set of all good bands
• the set of odd numbers
• the set of small numbers

• 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, 9}
• Find n(B).
• True or false: 
• True or false:  
• 
• 
•  

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

If , find  and draw a Venn diagram illustrating the composition of U.

• 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, and 332 were blank (no boxes checked).

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

• Determine how many cards, in an ordinary deck of 52, fit the description.

a.  clubs or twos
b.  face cards or diamonds
c.  threes or sixes
d.  threes and sixes

Picture of a Standard Deck of Playing Cards

Hearts – Red	Diamonds – Red
Clubs – Black	Spades – Black