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On (A={0,1,2,3}), (a*b) is the remainder when (ab) is divided by (4). Which element has a multiplicative inverse?

Answer and explanation

Correct answer: (3)

Step 1: The identity for this operation is (1). Step 2: (3*3) gives the remainder of (9) on division by (4), which is (1). Step 3: In modular multiplication, elements relatively prime to the modulus have inverses.

Related tags

Binary OperationsModulo MultiplicationInverseRelations And FunctionsMathematicsClass 12 Mcq

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