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Byju's Answer
Standard XI
Mathematics
Infinite GP
If 114+124+13...
Question
If
1
1
4
+
1
2
4
+
1
3
4
+
⋯
upto
∞
=
π
4
90
,
then the value of
1
1
4
+
1
3
4
+
1
5
4
+
⋯
upto
∞
is
A
π
4
45
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B
π
4
96
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C
π
4
124
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D
π
4
196
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Solution
The correct option is
B
π
4
96
1
1
4
+
1
3
4
+
1
5
4
+
1
7
4
+
…
=
(
1
1
4
+
1
2
4
+
1
3
4
+
1
4
4
+
1
5
4
+
…
)
−
(
1
2
4
+
1
4
4
+
1
6
4
+
…
)
=
π
4
90
−
1
2
4
(
1
1
4
+
1
2
4
+
1
3
4
+
…
)
=
π
4
90
−
1
16
(
π
4
90
)
=
π
4
96
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