Answer
$\sum_{i=1}^{15} \frac{i}{i+2}$
Work Step by Step
The numerator starts at $1$ and increases by $1$ at each term until it reaches $15$, the denominator starts at $3$ and increases by $1$ at each term until it reaches $17$. Thus the formula:
$\sum_{i=1}^{15} \frac{i}{i+2}$
