Ju.st purchase I pad. Did not set up but forgotten passcode.l
just purchase a refurbished iPad forgoton pass code
how to unlock
iPad, iPadOS 16
If you forgot a passcode that you changed within the last 72 hours, see the following for instructions: Temporarily use your old passcode when you forget your new passcode on iPhone or iPad - Apple Support
Otherwise, there is an Apple article that explains what to do if you have forgotten an iPhone or iPad passcode. Click on the following link: If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support
If that is not an option, you will need to use a computer. See: If you forgot your iPad passcode - Apple Support