Give an example of three sets A,B,C such that A intersection B is not equal to phi, B intersection C is not equal to phi, A intersection C is not equal to phi and A intersection B intersection C = phi.

A {1,2}
 
B {2,3}
 
C {3,1}
 
now, A intersection B= {2}
 
B intersection C= {3}
 
C intersection A = {1} 
 
but  A intersection B  intersection C= phi
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