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Byju's Answer
Standard X
Mathematics
Variance and Standard Deviation
If ∑i=1π i=nn...
Question
If
π
∑
i
=
1
i
=
n
(
n
+
1
)
2
, then
π
∑
i
=
1
(
3
i
−
2
)
=
A
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B
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C
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D
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Solution
The correct option is
A
π
∑
i
=
1
= 3
π
∑
i
=
1
i
- 2
π
∑
i
=
1
1
= 3
n
(
n
+
1
)
2
- 2n =
n
(
3
n
−
1
)
2