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Mathematics
Problem
Evaluate
∫
0
∞
x
3
e
−
x
d
x
\displaystyle\int_{0}^{\infty} x^{3} e^{-x}\,dx
∫
0
∞
x
3
e
−
x
d
x
. a)
24
24
24
b)
6
6
6
c) The integral diverges d)
3
3
3
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