Question

Is (√2, 1, 1/2) ε Q×Z×R

Answer 1

Since $\sqrt 2 \notin Q$ then $\left( {\sqrt 2 ;\,1;\,\frac{1}{2}} \right) \notin Q \times Z \times R$

Answer: $\left( {\sqrt 2 ;\,1;\,\frac{1}{2}} \right) \notin Q \times Z \times R$