Problems on Numbers - Quantitative Aptitude (MCQ) questions for Q. 20617

Q.  What is the value of (12 + 22 + 32 + 42  + ----- + 102)
- Published on 07 Jul 17

a. 295
b. 324
c. 385
d. 391

ANSWER: 385
 
(12 + 22 + ….. + n2) = (1/6) n(n + 1) (2n + 1)
Here, n = 10
Therefore,
(12 + 22 + ….. + 102) = (1/6) 10 (10 + 1) ( 2 x 10 + 1)
= (1/6) x 10 x 11 x 21
= 385

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