When i sell my ipad and get a new one can i get all my apps back?

Yes. If they are still in your iTunes library, simply sync all back over to the new iPad. Otherwise, redownload again at no cost from the App Store.

Downloading past purchases from the App Store, iBookstore, and iTunes Store

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Yes, but only if you do a backup of the current iPad before selling it. When the new iPad arrives, restore it from that same backup.

iOS: How to back up

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