If a is an element "not in" set A, then a∉A.
If the number of elements in each of universal set, set A and set B are represented as n(U), n(A), n(B) respectively, then the number of elements that are not in set A and not in set B is given by ___.
If set A has p element and set B has q elements, then the number of element in set (A × B) is _____.