Question

a=[1,2] b=[b,c,d] c=[a,c,d,e] (a-c) u (c-b) u (a n b n c )
a= {a,b,c,d} b= {a,c,e} c= a d={b,d,e} e={b,c,d,e}

Answer 1

A - C = {b} 
C - B = {a, e} 
A ∩ B ∩ C = {c} 

Assim. 

(A - C)U(C - B)U(A ∩ B ∩ C) = {b} U {a, e} U {c} = {a, b, c, e}........Resposta: letra A.