" The number of reflexive relations of a set with four elements is equal to "

The number of relations on a set containing 3 elements is ……………..

If the numbers of different reflexive relations on a set A is equal to the number of different symmetric relations on set A, then the number of elements in A is

If the numbers of different reflexive relations on a set A is equal to the number of different symmetric relations on set A, then the number of elements in A is

Number of relations of a set having 5 elements are

The number of relations on a set containing 3 elements is