8. Let R be the relation defined on 0, (set of non-zero rational numbers) defined by
R = {(a, b) : a, b e Qob
Check the relation R for reflexivity, symmetricity and transitivity,
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Since a−a=0 and 0 is an even integer
(a,a)∈R
∴ R is reflexive.
(ii) If (a−b) is even, then (b−a) is also even. then, if (a−b)∈R,(b,a)∈R
∴ The relation is symmetric.
∴ R is transitive.
Since R is reflexive, symmetric and transitive, it is an equivalence relation.
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