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Mathematics
Problem
For the series with general term
a
n
=
(
−
1
)
n
+
1
b
n
a_n=(-1)^{n+1}b_n
a
n
=
(
−
1
)
n
+
1
b
n
, where
b
n
>
0
b_n>0
b
n
>
0
, state the limit condition on
b
n
b_n
b
n
that must be satisfied for the series to converge.
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