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Mathematics
Problem
Find the coefficient of
a
3
b
4
c
5
a^3 b^4 c^5
a
3
b
4
c
5
in the expansion of
(
b
c
+
c
a
+
a
b
)
6
(bc+ca+ab)^6
(
b
c
+
c
a
+
ab
)
6
.
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