For which of the following cases A and B are equivalent?

• A = {a, b, c,…, z}, B = {1, 2, 3,…, 24}
• A = {1/3,1/2,3/5}, B = { x : x = n/n+2, n ε N}
• A = {2, 4, 6}, B = {(2, 4), (4, 6), (2, 6)}
• A = { x : x = ( n3 - 1 )/ ( n3 + 1) , n ε W, n ≤ 3} , B = { 0,7/9,13/14}