Find the general term of the sequence.

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The given sequence is : $2\frac{1}{2}, 1\frac{7}{13}, 1\frac{1}{9}, \frac{20}{23}, ........$. I subtracted the 2nd and 1st term and the result was $-\frac{10}{13}$ and then the 3rd and 2nd term and the result was $-\frac{50}{117}$.

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It is simple now...

Your sequence is, $\frac{20}{8}, \frac{20}{13}, \frac{20}{18}, \frac{20}{23}, \cdots$

Observe that the denominator is in AP with the common difference of 5.

And clearly, the sequence is in harmonic progression.