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Mathematics
Problem
Let
r
(
x
)
=
x
4
ln
x
r(x)=x^{4}\ln x
r
(
x
)
=
x
4
ln
x
for
x
>
0
x>0
x
>
0
. What is the coefficient of
ln
x
\ln x
ln
x
in
r
(
4
)
(
x
)
r^{(4)}(x)
r
(
4
)
(
x
)
? a)
50
50
50
b)
24
24
24
c)
0
0
0
d)
12
12
12
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