What is the possible number of asymmetric relations on a set of 5 elements

is logically equivalent to 

15 If A {5, 7, 8, 9}, B = {3, 4, 5, 6} and C = {2, 4, 6, 8, 10}; then is

Let R be the relation on the set R of all real numbers defined by aRb iff |a-b|≤1. Then R is:

Consider a set A = {1,2,3}. The binary relation R = {(1,1), (1,2), (1,3), (3,1), (3,2)} on A is

Given set A = {1,2,3} and B = {a,b,c,d}. Let PA be the cardinality of the power set of A and PB be the cardinality of the power set of B. Which of the following is true?

If A is set of all positive even numbers less than ten, B is a set all positive odd numbers less than ten, C is set of prime numbers less than ten then |AUBUC| is

The set A= is

What is the possible number of reflexive relations on a set of 5 elements

If R ={ (1,2),(2,3),(3,3)} be a relation defined on A= {1,2,3} then the transitive closure of R is