**PROGRESSIONS**

Calculus Level 3

If Sn=r=1n2r+1r4+2r3+r2 S_{n}=\sum_{r=1}^n\frac{2r+1}{r^{4}+2r^{3}+r^{2}} then S20S_{20} is equal to nn+1\frac{n}{n+1} then find n+1\sqrt{n+1}

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