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Q1
:
(1
2
+ 2
2
+ 3
2
+ ... + 10
2
) = ?
A
345
B
385
C
330
D
365
Solution
ANS:
D
- 385
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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