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What is the solution set of the quadratic inequality $6 x^{2}+1 \leq 0$ ? $\{x \mid x \in \mathbb{R}\}$ $\left\{x \left\lvert\, x=-\frac{1}{6}\right.\right\}$ $\varnothing$ $\left\{x \left\lvert\, x=\frac{1}{6}\right.\right\}$ Mark this and return Save and Exit Next Submit