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Mathematics
Problem
Find the
(
n
+
1
)
th
(n+1)\text{th}
(
n
+
1
)
th
term from the end in the expansion of
(
2
x
−
1
x
)
3
n
\left(2x - \frac{1}{x}\right)^{3n}
(
2
x
−
x
1
)
3
n
.
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