Set theory practice

What is an element?

• A member of a set

• Group of objects

• The intersection of two sets

• Subset

What is the union of two sets?

• Some elements from one set.

• All the elements from both sets, without any duplicates.

• The elements that are unique to both sets.

• The elements that are common to both sets.

What is the intersection of two sets?

• A set with no elements

• All the elements in two sets

• Random elements

• Set of common elements

• 4, 0, -9, 7

• 0, 4

• 0, 2, 4, 6

• 7, 2, 0

• 4, 0, -9, 7

• 0, 4

• 4, 0, -9, 7, 2, 6

• 2, 4, 6, 7

Answer explanation

This is asking for the union! All elements, with no repeats

• 2, 4, 6, 8

• 4, 8, 12

• 0, 5, 8, 6

• 4, 5, 8, 10, 12, 0, 6, 13

Answer explanation

This is asking for the union! All elements, with no repeats

• 4, 5, 8, 10, 12

• 0, 4, 6, 8, 12, 13

• 4, 8, 12

• 4, 5, 8, 10, 12, 0, 6, 13

T = {4, -1, 2, -5, 7} and S = {3, -2, -1, 7, -5, 8}

What is the union of T and S?

• 4, -1, 2, -5

• 4, -1, 2, -5, 7, 3, -2, 8

• -1, -5, 7

• -1, -2, -5

T = {4, -1, 2, -5, 7} and S = {3, -2, -1, 7, -5, 8}

What is the intersection of T and S?

• -1, -5, 7

• -1, 2, 3

• 4, -1, 2, -5, 7, 3, -2, 8

• 3, -2, -1, 7, -5, 8

• 0, 4

• -3, 0, 4, 6

• -3, 0, 4, 6, 0, 2, 4, 7

• -3, 0, 4, 6, 2, 7

Answer explanation

Elements in the union should NOT repeat!