MCQ Practice Mathematics 📖 a + b + c = 21 এবং ab + bc + ca = 143 হলে a2 + b2 + c2 এর মান কত? A 155 B 160 C 165 D 175 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 Previousa + b = 9m এবং ab = 18 m2 হলে a - b এর মান কত? Nexta + b + c = 9 এবং ab + bc + ca = 31 হয়, তবে a2 + b2 + c2 = ?
