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On positive integers, (a*b=\operatorname{lcm}(a,b)) is defined. What is the identity element of this operation?

Answer and explanation

Correct answer: (1)

Step 1: For identity (e), (\operatorname{lcm}(a,e)=a) for every positive integer (a). Step 2: (\operatorname{lcm}(a,1)=a), so (e=1). Step 3: In the least common multiple operation, (1) acts as the identity.

Related tags

Binary OperationsLcmIdentityPositive IntegersRelations And FunctionsMathematicsClass 12 Mcq

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