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Byju's Answer
Standard X
Mathematics
Sum of First n Natural Numbers
Find the sum ...
Question
Find the sum of n terms of the series
1
2.4
+
1.3
2.4.6
+
1.3.5
2.4.6.8
+
1.3.5.7
2.4.6.8.10
+
.
.
.
.
Open in App
Solution
⇒
t
n
=
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
−
1
)
2
⋅
4
⋅
6
⋅
⋅
⋅
(
2
n
+
2
)
t
n
=
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
−
1
)
2
⋅
4
⋅
6
⋅
⋅
⋅
2
n
−
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
+
1
)
2
⋅
4
⋅
6
⋅
⋅
⋅
(
2
n
+
2
)
t
n
−
1
=
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
−
3
)
2
⋅
4
⋅
6
⋅
⋅
⋅
(
2
n
−
2
)
−
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
−
1
)
2
⋅
4
⋅
6
⋅
⋅
⋅
2
n
.
.
.
t
1
=
1
2
−
1
2
⋅
3
4
S
n
=
1
2
−
1
⋅
3
⋅
5
⋅
⋅
⋅
(
2
n
+
1
)
2
⋅
4
⋅
6
⋅
⋅
⋅
(
2
n
+
2
)
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0
Similar questions
Q.
1
2.4
+
1.3
2.4.6
+
1.3.5
2.4.6.8
+
1.3.5.7
2.4.6.8.10
+
.
.
.
.
.
.
.
.
.
∞
is equal to
Q.
Find the sum of n terms of the series
1
1.3
+
2
1.3.5
+
3
1.3.5.7
+
4
1.3.5.7.9
+
.
.
.
Q.
Prove that
1
−
1
2
+
1
2
+
1.3
2.4
.
1
2
2
−
1.3.5
2.4.6
.
1
2
3
+
1.3.5.7
2.4.6.8
.
1
2
4
−
.
.
.
=
√
2
3
Q.
Find whether the following series are convergent or divergent:
1
+
1
2
.
x
2
4
+
1.3.5
2.4.6
.
x
4
8
+
1.3.5.7.9
2.4.6.8.10
.
x
6
12
+
.
.
.
.
Q.
Find the sum to infinite terms of the series
7
5
(
1
+
1
10
2
+
1.3
1.2
⋅
1
10
4
+
1.3.5
1.2.3
⋅
1
10
6
+
.
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.
)
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