Question 23
Let $a$, $b$, $c$ be positive real numbers with $a+b+c \geq a b c$. Prove that of the following three inequalities at least two are true:
$$
\frac{2}{a}+\frac{3}{b}+\frac{6}{c} \geq 6, \quad \frac{2}{b}+\frac{3}{c}+\frac{6}{a} \geq 6, \quad \frac{2}{c}+\frac{3}{a}+\frac{6}{b} \geq 6
$$
$$
\frac{2}{a}+\frac{3}{b}+\frac{6}{c} \geq 6, \quad \frac{2}{b}+\frac{3}{c}+\frac{6}{a} \geq 6, \quad \frac{2}{c}+\frac{3}{a}+\frac{6}{b} \geq 6
$$