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On (A={1,2,3,4,5,6,7,8}), (aRb) holds when (a) and (b) have the same divisibility status by (4) and by (2). How many equivalence classes are formed?

Answer and explanation

Correct answer: (3)

Step 1: The classes are not divisible by (2): ({1,3,5,7}), divisible by (2) but not (4): ({2,6}), and divisible by (4): ({4,8}). Step 2: These are three non-empty classes. Step 3: Count the non-empty groups formed by the combined statuses.

Related tags

Divisibility StatusNumber Of ClassesEquivalence RelationRelations And FunctionsMathematicsClass 12 Mcq

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