A={2,4,8,12}n(A)=4B={1,2,3,4} n(B)=4C={4,8,12,14}n(C)=4D={3,1,4,2}n(D)=4E={−1,1}n(E)=2F={0,a}n(F)=2G={1,−1}n(G)=2H={0,1}n(H)=2Number of elements in A,B,C,D are same i.e. all have 4 elements. So ,they are comparable. Now, we see B and D has same elements.So, B and D are equal sets.Similarly, E,F,G, H are comparable as they all have same number of elements i.e. 2.Clearly , E and G has same elements.So, E and G are equal sets.