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On (A={0,1,2}), (a\ast b) is the remainder of (a+b) upon division by (3). What is the inverse of (1)?

Answer and explanation

Correct answer: (2)

Step 1: The identity for this operation is (0). Step 2: The inverse (x) of (1) must make the remainder of (1+x) equal to (0). Since (1+2=3), the remainder is (0). Step 3: In remainder operations, make the sum a multiple of the modulus.

Related tags

Inverse ElementModulo AdditionRemainderBinary OperationsRelations And FunctionsMathematicsClass 12 Mcq

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