Compliment of Sets

        
    A’ is the complement of set A . This set contains all the elements which are not there in set A. 
    Let us take an example 
    if U ={1,2,3,4,5} 
      A={1,2,3} 
      Then A'={4,5}   
    
    We shall take a Look at some basic Formulae of Compliment Sets 
    A U A'=U 
    A ∩ A'=φ