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On the set of non-zero real numbers, (aRb) if and only if (\frac{a}{b}>0). On what basis is this an equivalence relation?

Answer and explanation

Correct answer: It groups numbers with the same sign

Step 1: (\frac{a}{a}=1>0), so the relation is reflexive. Step 2: (\frac{a}{b}>0) means (a) and (b) have the same sign, so the reverse ratio is also positive. Step 3: Having the same sign is transitive, so it forms two equivalence classes: positive and negative.

Related tags

Nonzero Real NumbersSame SignEquivalence RelationClassesRelations And FunctionsMathematicsClass 12 Mcq

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