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Combinatorics
medium
0:00.0
Find the coefficient of
x
2
y
4
x^2 y^4
x
2
y
4
in the expansion of
(
x
+
y
)
6
(x+y)^6
(
x
+
y
)
6
.
A
6
B
10
C
15
D
20
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