I want to delete all the data

I have to sale my MacBook and before delivery I want to delete all the data. Howwwwwwwwwww ?..

First, go to  > About this Mac and see Version. If it's 10.6, 10.5 or your Mac came with DVDs:
1. Insert the Mac OS X DVD that came with your Mac and press C key while your Mac is starting.
2. Open Utilities > Disk Utility, choose Macintosh HD in the sidebar and erase the disk.
3. Install Mac OS X. When the installation finishes, turn off the computer. Remember to give the DVDs to the owner.
If it's 10.8, 10.7 or your Mac didn't come with discs:
1. Press Command, Option and R keys while your Mac is starting and open Disk Utility.
2. Select Macintosh HD in the sidebar and erase the drive.
3. Install OS X. When the installation finishes, turn off the computer

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tt2

I want to delete all the data

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