# CBSE Class 12-science Answered

**In R - {-1}, there is a binary operation '*' defined by a*b = a+b - ab, for all a,b belongs to R - {-1}. Is R - {-1} group?**

Asked by goswamineha2611 | 31 Aug, 2020, 06:32: PM

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Answered by Renu Varma | 01 Sep, 2020, 02:08: PM

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