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UPSC NDA II 2013 Mathematics Paper
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© examsnet.com
Question : 57
Total: 120
The arithmetic mean of the squares of the first
n
natural numbers is
n
(
n
+
1
)
(
2
n
+
1
)
6
n
(
n
+
1
)
(
2
n
+
1
)
2
(
n
+
1
)
(
2
n
+
1
)
6
(
n
+
1
)
(
2
n
+
1
)
3
Validate
Solution:
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