Equal Sets
Two sets A and B are equal if they contain exactly the same elements
Example:
A = {1, 2, 4} and B = {4, 2, 1}
So set A is equal set B (A = B)
Equivalent Sets
Two sets A and B are said to be equivalent if they have the same cardinality i.e. n(A) = n(B)
Example:
A = {a, i, u, e, o} and B = {2, 3, 5, 7, 11}
Set A is equivalent set B (A ∼ B) because n(A) = n(B) = 5