Numbers | Arithmetic aptitude | Discussion Page | Question 36

1)

If (1² + 2² + 3² + ..... + 10²) = 385, then the value of (2² + 4² + 6² + ..... + 20²) is :

A) 770

B) 1155

C) 1540

D) 385

Answer:

Option C

Explanation:

(1² + 2² + 3² + ..... + 10²) = 385

(2² + 4² + 6² + ..... + 20²) = 2²(1² + 2² + 3² + ..... + 10²)

= 4(385)

= 1540