Question: Integrate: int x ^ ( n ) e ^ ( x ) dx Note: n ( n - 1 ) ( n - 2

Integrate: \int x^(n)e^(x)dx
Note: n(n-1)(n-2)*cdots*(n-k)=(n!)/((n-k-1)!)
Hint: You may wish to start by integrating something like n=4

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