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On (A={1,2,4,8}), (a*b=\gcd(a,b)). What is the identity element?

Answer and explanation

Correct answer: (8)

Step 1: For identity (e), we need (\gcd(a,e)=a). Step 2: This happens when (e) is a multiple of every (a), and (8) works in the set. Step 3: For a (\gcd) operation on divisors of a number, the identity is often the largest element.

Related tags

Binary OperationsGcd OperationIdentityFinite SetRelations And FunctionsMathematicsClass 12 Mcq

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