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What is the potential at the center of the shell (r=0)?

What is the potential at the inner radius?

What is the potential at the outer radius? - I solved this using V = kQ/r. This part makes sense to me.

The first two questions should have the same answer I know. I'm not sure how to solve for them, since I know I can't use the same equation that I did for the outer ring. Is there a way without full out integrating?