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On (S={1,2,3,4,6,12}), (a*b=\gcd(a,b)). What is the identity element of this operation?

Answer and explanation

Correct answer: (12)

Step 1: Identity (e) must satisfy (\gcd(a,e)=a) for every (a\in S). Step 2: This happens when every (a) divides (e). Here (12) is a multiple of all elements of the set. Step 3: For a (\gcd) operation, the identity is usually a greatest common multiple-like element inside the set.

Related tags

Binary OperationsGcdFinite SetRelations And FunctionsMathematicsClass 12 Mcq

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