First slide

Relations XII

Question

If A = {1, 2, 3, 4} and R = {(1, 1), (2, 2), (3, 3)} then the relation R on the set A is

Moderate

A

reflexive and symmetric but not transitive
B

reflexive and transitive but not symmetric
C

symmetric and transitive but not reflexive
D

an equivalence relation

Solution

$4 \in A but (4, 4) \notin R \Rightarrow R is not reflexive$

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