Mathematics Logarithm Advance Logarithm Questions Question #570 (CAT-I) যদি a² + b² = 7ab হয়, তবে log[(a+b)/3] এর মান কোনটি? A 1/2(log a + log b) B log a + log b C 1/2(log a - log b) D 2(log a + log b)