📢 QuizNe.vn will officially cease operations on 27/08/2026. Thank you for being with us.
- $ S = \\\emptyset$ .
- $ S = \\\left\\\{ {10} \\\right\\\}$.
- $ S = \\\left\\\{ 6 \\\right\\\}$
- $ S = \\\left\\\{ 7 \\\right\\\}$.