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On integers, (aRb) holds when (a-b) is divisible by (7). Which is the equivalence class of (15)?

Answer and explanation

Correct answer: ({...,1,8,15,22,29,...})

Step 1: Integers related to (15) must differ from (15) by a multiple of (7). Step 2: (15) gives remainder (1) on division by (7), so all integers with remainder (1) are in the same class. Step 3: First identify the remainder to find the equivalence class quickly.

Related tags

Equivalence RelationModulo 7Equivalence ClassRelations And FunctionsMathematicsClass 12 Mcq

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