How to delete the purchased apps
HHow to delete the app from the purchased apps cateory permanently
apple ipad mini
You can't, you can only hide them via your computer's iTunes so that they don't show in the cloud for redownloading : Hide and unhide purchases in iTunes or iBooks on your Mac or PC - Apple Support (the 'x' might not show on an app's top left corner when you hover your mouse pointer over it, but clicking there should still hide it)