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If you don't know the passcode and if you are locked out, then the only option to get in back to the tab again is by resetting it. This will delete everything from it. This is how they designed it.
You can try to erase it from this site (make sure you erase this problem Tab and not any other devices) --> https://google.com/android/find
(Login with the same Google account you used on the Tab to erase it)
Please let me know if that didn't work, so I will continue to help you until we fix the problem
Note : This is not my final answer. I strive to provide Excellent service or 5 star service. If you feel you've received anything less or if you are not satisfied or if my solutions didn't work, please please let me know by replying here and I will stay with you and try my best to help you until you are fully satisfied or the issue is resolved.