Used macbook air running OS 10 and I do not know the admin password so I can't get "in"

Anyone know how to retrieve or work aorund not knowing a admin password?  I just bought a used macbook air running Mavricks and I don't know the **** password.  The company I bought the compuer from is only open from 5am till 5pm Mon-Fri and of course it is after that on a Friday night!
Any help would be appreciated.

Reboot holding down cmd-R. It will reboot to the recovery partition. Click the Utilitites menu, then Terminal.
In Terminal, type
resetpassword
and follow the prompts.
Matt

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