$$\lim_{x \to \infty}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \infty$$
$$\lim_{x \to 0^-}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \frac{1}{\left(3 n + 3\right)!}$$
Más detalles con x→0 a la izquierda$$\lim_{x \to 0^+}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \frac{1}{\left(3 n + 3\right)!}$$
Más detalles con x→0 a la derecha$$\lim_{x \to 1^-}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \frac{12}{\Gamma\left(3 n + 4\right)}$$
Más detalles con x→1 a la izquierda$$\lim_{x \to 1^+}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \frac{12}{\Gamma\left(3 n + 4\right)}$$
Más detalles con x→1 a la derecha$$\lim_{x \to -\infty}\left(\frac{\left(3 x\right)! \left(x + 1\right)!}{x! \left(3 n + 3\right)!}\right) = \frac{\left(-\infty\right)!}{\left(3 \left(n + 1\right)\right)!}$$
Más detalles con x→-oo