Think Bolzano

Calculus Level 1

Fill in the blank.

Let $$f(x)$$ be a continuous real-valued function with $$f(1) = -1$$ and $$f(4) = 3.$$ If $$1 < c < 4,$$ then each of the following except for $$\text{______}$$ is guaranteed to be a value of $$f(c).$$

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