1. [5 Marks] Let R1 = {real x:x-1}. Define a binary operation on R-1 by a*b = ab+a+b.
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1. [5 Marks] Let R1 = {real x:x-1}. Define a binary operation on R-1 by a*b = ab+a+b.
1. [5 Marks] Let R1 = {real x:x-1}. Define a binary operation on R-1 by a*b = ab+a+b.
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