C = { A, -3, H, 5, 4, C }
Set C contains 6 members or elements: A, -3, H, 5, 4, and C.

D = {}     E = ∅
If a set has no members, it is an empty set. Sets D and E are both empty sets.

The dark shaded region represents A ∩ B.

The dark shaded regions represents A ∪ B.

Example 1

Write answers in ascending order, separated by commas.  Example:  A = {-3, 1, 2, 5 }.
G = { 0, 3, 5 }     H = { 2, 3, 4, 5 }

Intersection		Union
G 0 3 5 H 2 3 4 5 ↓ ↓ G ∩ H 3 5		G 0 3 5 H 2 3 4 5 ↓ ↓ ↓ ↓ ↓ G ∪ H 0 2 3 4 5
G  ∩ H = {}		G ∪ H = {}

Example 2

Write answers in ascending order, separated by commas.  Example:  A = {-3, 1, 2, 5 }.
G = { -2, -1, 0, 4, 5 }     H is the set of positive even numbers.
Find G ∩ H.

H contains any and all positive even numbers.
So an intersection of sets G and H is the set of positive even numbers in set G.

Remember that 0 is neither positive or negative.

G	-2	-1	0	4	5
positive				✓	✓
even	✓		✓	✓
				↓
G ∩ H				4

G  ∩ H = {}

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