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Integrals
hard
0:00.0
Evaluate
∫
0
∞
x
n
e
−
x
d
x
\int_0^{\infty} x^n e^{-x} dx
∫
0
∞
x
n
e
−
x
d
x
for
n
=
3
n=3
n
=
3
.
A
3
3
3
B
6
6
6
C
1
1
1
D
24
24
24
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