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On (\mathbb{Z}), (a*b=a+b+ab). Why does this operation not form a group on the whole set?

Answer and explanation

Correct answer: Some elements have no inverse

Step 1: The operation is closed in (\mathbb{Z}) and associative. Step 2: The identity is (0). For inverse, (a*x=0) gives (x=\frac{-a}{1+a}). Step 3: For (a=1), (x=-\frac{1}{2}), not an integer, so not every element has an inverse.

Related tags

Binary OperationsGroup PropertyIntegersRelations And FunctionsMathematicsClass 12 Mcq

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