Equation  Set Elements 
{1} ∪ {2, 3}  
{1, 2, 3, 4} ∩ {2}  
{1, 3, 5, 7} ∩ {1, 2, 3, 4}  
{x, y, z} ∪ {a}  
{3, 4, 5}\{1}  
{a} ∪ {z}  
{1, 5} ∪ {4, 5, 6}  
{9, 5, 1} ∩ {1, 2, 3, 4, 5}  
{3, 5, 7} ∩ {1, 4, 9}  
{6} ∪ ∅  
 Equation  Set Elements 
{9, 5, 2, 4, 8}\{2, 4}  
∅ ∩ {4, 1, 7, 2}  
{j  j is a multiple of 3} ∩ {j  0 ≤ j ≤ 6}  
{x  1 < x < 3} ∪ {x  2x = 6}  
{x  1 ≤ x ≤ 9} ∩ {x  x is a square}  
S ∪ {a  a = 2s, s ∈ S}, where S = {1, 4}  
{z  z is odd} ∩ {x  x is even}  
{a  a is prime} ∩ {b  b is even}  
(Z\{0})' (Assume universe = Z)  
P({1, 2}) ∩ {{1}}  

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