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Q)
If
|
a
|
<
1
,
b
=
∞
∑
k
=
1
a
k
k
then a is equal to :
(
a
)
∞
∑
k
=
1
(
−
1
)
k
b
k
k
(
b
)
∞
∑
k
=
1
(
−
1
)
k
−
1
b
k
k
!
(
c
)
∞
∑
k
=
1
(
−
1
)
k
b
k
(
k
−
1
)
!
(
d
)
∞
∑
k
=
1
(
−
1
)
k
−
1
b
k
(
k
+
1
)
!
Share
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