Question

(112 + 122 + 132 + ... + 202) = ?

Options:
A .  385
B .  2485
C .  2870
D .  3255
Answer: Option B

(112 + 122 + 132 + ... + 202) = (12 + 22 + 32 + ... + 202) - (12 + 22 + 32 + ... + 102)



(112 + 122 + 132 + ... + 202) = ?
Ref: (12 + 22 + 32 + ... + n2) =
1
n(n + 1)(2n + 1)
(112 + 122 + 132 + ... + 202) = ?
   
6


= 
(112 + 122 + 132 + ... + 202) = ?
20 x 21 x 41
-
10 x 11 x 21
(112 + 122 + 132 + ... + 202) = ?
6
6

= (2870 - 385)


= 2485.

Was this answer helpful ?
Next Question

Submit Solution

Your email address will not be published. Required fields are marked *

More Questions on This Topic :


Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

Chapter 3.1 : Overview of Finance & Accounts Department Chapter 3 : Finance & Accounts SAIL E0 - GFM 2024
Chapter 2.1 : Overview Chapter 2 : Materials Management SAIL E0 - GFM 2024
Chapter 1.1 : Personnel Functions- An overview Chapter 1 : Personnel Management SAIL E0 - GFM 2024
GPOE / GPA Combined 1 Free CBT Mock Test SAIL E0 2024
CBT Mixed Test 1 GPOE/GPA SAIL E0 2024