With MEMBERSHIP, you must say an element of the set A
with SUBSETS, you must decide if the set A is a subset of B
with UNION you have to enter an element of A U B
with INTERSECTION you have to enter an element of A ∩ B
with DIFFERENCE you have to enter an element of A - B
with CARDINALITY you must know the cardinality of a set
with CARTESIAN PRODUCT you have to complete a pair (a, b) of the cartesian product of two sets
The application guide you throughout the different problems.