Calculating Fmax

The Fmax formula is the largest variance/smallest variance.

Is this for the entire level of IV or for separate cell comparisons?

For example, as in the hw, with three levels of IV, will there be one Fmax (largest variance out of the three levels/smallest variance out of the three levels)?

Or three Fmax depending on the levels of comparison? Ex. In comparing Level 1 and 2, if the variance of level 2 is bigger than 1, then the fmax will be variance of 2/variance of 1.