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Combinatorics
hard
0:00.0
Determine the coefficient of
x
6
x^6
x
6
in the expansion of
(
1
+
x
+
x
2
)
4
(1+x+x^2)^4
(
1
+
x
+
x
2
)
4
.
A
16
B
19
C
24
D
32
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