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JEEMAIN and NEET
>>
Mathematics
>>
Class11
>>
Sequence and Series
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Q)
The sum
1
+
3
x
+
9
x
2
+
27
x
3
+
.
.
.
.
∞
, (
x
≠
0
) is finite if
(
a
)
|
x
|
<
1
(
b
)
|
x
|
>
1
(
c
)
|
x
|
<
3
(
d
)
|
x
|
>
3
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