Definition of Symmetric relation

Definition of Reflexive relation

Define a symmetric relation.

Define a symmetric relation.

Define a symmetric relation.

Definition of Transitive relation

If n(A) = 4, then number of symmetric relations that can be defined on A is

If a relation R in N defined as R =((a ,b):a (A) Only transitive relation. (B) Only symmetric relation. (C) Only reflexive relation. (D) Transitive and symmetric relation.

If A={1,2,3}, the number of symmetric relations in A is

What is the adequate definition of language relation preestimation: