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On the set (A={1,2,3,4}), the operation (a*b=\min(a,b)) is defined. What is the identity element of this operation?

Answer and explanation

Correct answer: (4)

Step 1: For identity (e), we need (a*e=a) for every (a \in A). Step 2: Here (a*e=\min(a,e)), so (e) must be the greatest element of the set. Step 3: In a minimum operation on a finite ordered set, the greatest element works as the identity.

Related tags

Binary OperationsIdentity ElementClass 12 Relations And FunctionsRelations And FunctionsMathematicsClass 12 Mcq

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