PYQ Vault
Bank
Guides
Notes
Mocks
Board
Blog
About
Bank
Guides
Notes
Mocks
Board
NDA · Maths · Statistics
NDA Statistics — Formulas 2
Question
1
of 13
1.
Which is the mean of the squares
1
2
,
2
2
,
…
,
n
2
1^2, 2^2, \ldots, n^2
1
2
,
2
2
,
…
,
n
2
?
A
(
n
+
1
)
(
2
n
+
1
)
6
\dfrac{(n+1)(2n+1)}{6}
6
(
n
+
1
)
(
2
n
+
1
)
B
n
(
n
+
1
)
2
\dfrac{n(n+1)}{2}
2
n
(
n
+
1
)
C
(
n
+
1
)
(
2
n
+
1
)
2
\dfrac{(n+1)(2n+1)}{2}
2
(
n
+
1
)
(
2
n
+
1
)
D
n
(
2
n
+
1
)
6
\dfrac{n(2n+1)}{6}
6
n
(
2
n
+
1
)
Back
Skip