MathematicsBinary operationsJAMB
The operation * on real numbers is defined by a * b = a + b − ab, with identity element 0. Find the inverse of 2.
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Answer: A. 2
2 * x = 0 gives 2 + x − 2x = 0, so x = 2. Check: 2 * 2 = 4 − 4 = 0.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.