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On natural numbers, (aRb) if and only if (a) and (b) have the same greatest prime factor. What kind of numbers form the equivalence class of (18)?

Answer and explanation

Correct answer: Numbers whose greatest prime factor is (3)

Step 1: (18=2\cdot 3^2), so its greatest prime factor is (3). Step 2: The relation checks only the greatest prime factor. Step 3: Therefore the class contains all natural numbers whose greatest prime factor is (3).

Related tags

Prime FactorEquivalence ClassNatural NumbersClassificationEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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