The question is a little odd but I would think he was referring an android tablet. There are also other distros out there besides RedHat that are free although I'm not sure which ones are compatible or if that's even possible. I would recommend doing a google search since that's all I would have done to give you an answer anyway.
I'll leave you with this link although you probably don't really want RedHat on a tablet. There are plenty of other distros with packages more suited for mobile devices out there.