If you have forgotten your passcode and get locked out of your iPad, you can take the following steps to unlock it:
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Connect your iPad to whatever computer you normally use to sync with iTunes.
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Right click on iPad in the left hand column of iTunes and click on “Backup”.
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After the backup is finished running, select “Restore” to restore your iPad to the most recent backup date.
OR:
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If you have never used iTunes unplug the cable from your iPad, but leave it plugged into your computer.
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Press Sleep/Wake until the red slider appears and iPad turns off.
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Press and hold the Home button, reconnect the USB cable to the iPad and wait for it to turn on.
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Continue holding the Home button until you see “Connect to iTunes”, then release the Home button.
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iTunes will alert you that it has detected the iPad in recovery mode. Click OK and then click Restore.
Source: Apple Support