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Aptitude
General Knowledge
Verbal Reasoning
Computer Science
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Numbers
(12 + 22 + 32 + ... + 102) =?
330
345
365
385
Show Answer
Correct Answer:
385
Explanation:
We know that (1
2
+ 2
2
+ 3
2
+ ... +
n
2
) =
1
n
(
n
+ 1)(2
n
+ 1)
6
Putting
n
= 10, required sum =
❨
1
x 10 x 11 x 21
❩
= 385
6
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