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Let A be a set of all real numbers except 1 and 0 be an operation on A defined by aob = a+b-ab for all a, b€A. Prove that A is closed under a given operation.

Answer» Let A be a set of all real numbers except 1 and 0 be an operation on A defined by aob = a+b-ab for all a, b€A. Prove that A is closed under a given operation.


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