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Solution


Q.

Which one of the following is an identity relation
1 (1, 2), (2, 3), (1, 3)  
2 (5, 5), (4, 4), (2, 2)  
3 (1, 3), (3, 1), (2, 3)  
4 None of the above  

Ans.

(2)

Ans.   (5, 5), (4, 4), (2, 2)

Explanation:

A relation is called an identity relation if

A={(a,a):a∈A}

So, (5, 5), (4, 4), (2, 2) is an identity relation.