If A and B are sets, the intersection of A with B, denoted A[tex]\cap[/tex] B is the set consisting of elements that belong to both A and B. The union of A with B, denoted A [tex]\cup[/tex] B is the set consisting of elements that belong to either A or B,

or both.

A = {1, 3, 5, 8}

B = {3, 5, 7}

C = {2, 4, 6, 8}

Finding the Intersection and Union of Sets

Let and Find:

1. A [tex]\cap[/tex] B

2. A [tex]\cup[/tex] B

3. B [tex]\cap[/tex] (A [tex]\cup[/tex] C)

Let me see.

1. A [tex]\cap[/tex] B = the elements found in both sets.

A [tex]\cap[/tex] B = {3, 5}

2. A [tex]\cup[/tex] B = {1, 3, 5, 7, 8}

3. B [tex]\cap[/tex] (A [tex]\cup[/tex] C)

I first must find A [tex]\cup[/tex] C.

A [tex]\cup[/tex] C = {1, 2, 3, 4, 5, 6, 7, 8}

I now find B [tex]\cap[/tex] C.

B [tex]\cap[/tex] C = {3, 5, 7}

You say?