Question

Prove that (A+B) + A'.B' =1​

Answer 1

Explanation:

Let a and b be two integers such that (a,b)=1. Prove that (a+b,ab)=1. (a,b)=1 means a and b have no prime factors in common ab is simply the product ...

Answer 2

Prove: The set R∖{1} is a group under the operation ∗, where:

a∗b=a+b−ab,∀a,b∈R∖{1}.