MCQ Practice Mathematics 📖 x + y + z = 15 এবং x2 + y2 + z2 = 83 হলে, xy + yz + zx এর মান কোনটি? A 16 B 32 C 71 D 72 Favorite Practice Add to Book Explanation & Answer Detailed explanations and answers are restricted. Unlock full access by logging in to your account. 🔒 Unlock the detailed explanation and answers Log In / Sign Up Previousx + y এবং x - y = 8 হলে, xy -এর মান কত? Nextx/y এর সাথে কত যোগ করলে যোগফল 2y/x হবে?