$\displaystyle \left(-\infty, \frac{1}{6} \right)$\displaystyle \left(-\infty, \frac{1}{6} \right)

$\displaystyle \left(-\infty, \frac{2}{3} \right)$\displaystyle \left(-\infty, \frac{2}{3} \right)

$\displaystyle \left( \frac{1}{6},+\infty \right)$\displaystyle \left( \frac{1}{6},+\infty \right)

$\displaystyle \left( \frac{2}{3},+\infty \right)$\displaystyle \left( \frac{2}{3},+\infty \right)