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Photoshop: Elliptical Marquee tool selecting inverse with Quick Mask Mode

I'm working on a Quickmask project: Lesson: use the Elliptical Marquee tool to draw a perfect circle, hold the shift key as you draw to constrain the ellispse to a circle. Now enter quickmask mode by pressing Q. The circle you just drew will appear red solid circle. But when I do this , everthing outside of the circle is red. What am I doing wrong?
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