Question 636320
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
A = {1,2,3,4,5,6} 
B = {1,2} 
C = {6, 7}
a) A &#8745; B   {1,2}  
 b) A U C  {1,2,3,4,5,6,7} 
 c) B U C  {1,2,6,7} 
 d) (A U B) &#8745; C  {6}
 e) A U (B U C) {1,2,3,4,5,6,7} 
 f) (A &#8745; B) &#8745; C  { }
 g) (A &#8745; B) U C   {1,2,6,7}