replacing an ipad, what happens to paid apps?

[iadkwcs]

hi

im thinking of replacing my current ipad, the newest one out besides mini
im thinking about buying another ipad with more memory, or the ipad mini.

either way, when I sell my current ipad, will i be able to re-download all my paid apps?
got books on kindle app too, will i be able to retrieve all my books?

thanks