Question

Which of the following sets are equal? 

(i) A = {1, 2, 3, 4}, B = {4, 3, 2, 1} 

(ii) A = {4, 8, 12, 16}, B = {8, 4, 16, 18} 

(iii) X = {2, 4, 6, 8} 

Y = {x : x is a positive even integer and 0 < x < 10}

Answer 1

(i) Since A and B contain exactly the same elements, A and B are equal sets. 

(ii) A and B has different elements. 

∴ A and B are not equal sets. 

(iii) X = {2, 4, 6, 8}, Y = {2, 4, 6, 8} 

∴ X and Y are equal sets.