Given that 1²+2²+3²+..................+10² =385 ,what is the value of 3²+6² +9² .........30²?
Solution
Correct Answer: Option D
দেওয়া আছে ,
3²+6²+9²+........30²
=3²× 1²+(2× 3)² +(3× 3)² +.........+(3×10)²
=3²(1²+2²+3²..............+10²)
=3²×385
=9×385
=3,465
3²+6²+9²+........30²
=3²× 1²+(2× 3)² +(3× 3)² +.........+(3×10)²
=3²(1²+2²+3²..............+10²)
=3²×385
=9×385
=3,465
Practice More Questions on Our App!
Download our app for free and access thousands of MCQ questions with detailed solutions