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Mathematics
Problem
In the expansion of
(
x
2
+
3
y
)
9
(x^{2}+3y)^{9}
(
x
2
+
3
y
)
9
, find the coefficient of
x
6
y
3
x^{6}y^{3}
x
6
y
3
. Show all steps leading to your answer.
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