Question

define equivalent sets

Answer 1

In a equivalent set, the number of the elements of the sets are equal. 
Example, A is ( 12345 ), B is ( 67890 ). 
n(A) is 5, n(B) is 5. 
n(A) is equal to n(B).

Answer 2

$<b>hey mate$
Equal sets have the exact same elements in them, even though they could be out of order. Equivalent sets have different elements but have the same amount of elements. If we want to write that two sets are equivalent, we would use the tilde (~) sign. A set's cardinality is the number of elements in the set.

hope it helps...