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On (A={1,2,3,4}), (R={(a,b):a+b) is even(}). What type of relation is it?

Answer and explanation

Correct answer: equivalence relation

Step 1: (a+a=2a) is always even, so the relation is reflexive. Step 2: If (a+b) is even, then (b+a) is even, so it is symmetric. Step 3: If two numbers have the same parity as a middle number, they have the same parity with each other, so it is transitive.

Related tags

RelationsParityEquivalenceClass12Introduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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