Which of the following sets are equal? A = {a,b,c,d} B = {d,e,a,c} C = {d,b,a,c} D = {a,a,d,e,c,e}

Which of the following sets are equal?
A = {a,b,c,d}
B = {d,e,a,c}
C = {d,b,a,c}
D = {a,a,d,e,c,e}
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doplovif
Two sets are equal when they contain the exact same elements, in any order. Here, sets A and C are equal since they contain the elements a,b,c and d.
Sets a and c