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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
=
2
n=2
n
=
2
.
A
2
2
2
B
1
1
1
C
6
6
6
D
0
0
0
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