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Combinatorics
hard
0:00.0
What is the coefficient of
x
4
x^4
x
4
in the expansion of
(
1
−
2
x
)
−
3
(1-2x)^{-3}
(
1
−
2
x
)
−
3
?
A
160
B
240
C
320
D
80
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