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On (A={0,1,2}), (a*b) is the remainder when (ab) is divided by (3). What is the identity element?

Answer and explanation

Correct answer: (1)

Step 1: Multiplying by (1) keeps the number unchanged. Step 2: In (a*1), (a\cdot1=a), and its remainder modulo (3) is the same (a) for elements of (A). Step 3: For modulo multiplication, check (1) first as identity.

Related tags

Binary OperationsModulo MultiplicationIdentityFinite SetRelations And FunctionsMathematicsClass 12 Mcq

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