Simplify: \( \left(\frac{5}{6}\right)^{3} \)

To simplify \( \left(\frac{5}{6}\right)^{3} \), you raise both the numerator and the denominator to the power of 3. So, we have: \[ \left(\frac{5}{6}\right)^{3} = \frac{5^3}{6^3} = \frac{125}{216} \] Therefore, the simplified form of \( \left(\frac{5}{6}\right)^{3} \) is \( \frac{125}{216} \).