Union, Intersection, and Subsets

A = {1, 3, 5, 7, 9}

B = {2, 3, 5, 7}

What is A ∪ B ?

Hint: ∪ means union/or

• {3, 5, 7}

• {2, 3, 5, 7, 9}

• {2, 3, 5, 7}

• {1, 2, 3, 5, 7, 9}

The following is a subset of A = { 2, 4, 6, 8, 10 }, except

• X= {2 , 4}

• Y= {6,8,10}

• Z= {2,4,6,8}

• W={9}

Let H ={ 1,3,5 } and M={ 2,3,5,7 }. Which of the following shows H∩M ?

Hint: ∩ means intersection/and

• { }

• { 3, 5 }

• { 1, 2, 3, 5, 7 }

• { 1, 7 }

The number of students who like both Coke and Pepsi is:

• 20

• 10

• 5

• 45

Find n(A) when
A = {14, 16, 18, 20, 22, 24}

• 6
• 12
• 4
• 8