$\int_0^1 x(1-x)^n dx =$
- A$\frac{n+3}{(n+1)(n+2)}$
- B$\frac{1}{(n+1)(n+2)}$
- C$\frac{2n+3}{(n+1)(n+2)}$
- D$\frac{4}{(n+1)(n+2)}$
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