Use algebraic manipulation to show that for three input variables x 1 , x 2 , x 3 for m(1,2,3,4,5,6,7)= x 1+ x 2 +x

Use algebraic manipulation to show that for three input variables x ₁ , x ₂ , x ₃ for Σm(1,2,3,4,5,6,7)= x ₁₊ x ₂ +x ₃