Show that G=R-1 is an abelian group under the binary operation 𝑎∗𝑏=𝑎+𝑏−𝑎𝑏, ∀ 𝑎,𝑏∈𝐺.

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Show that 𝐺=𝑅−1 is an abelian group under the binary operation
a*b=a+b-ab, ∀ a,b G.
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Sir how to say a, b no equal to 1 please tell 🙏🙏🙏🙏

paprighosh