windows key and windows version

[AnuragSingh9]

my brother has purchased lenovo thinkpad in 2015 , one windows genuine OS came with that now for 2 years that PC is not in use , now i want to use that laptop but the serial key of genuine windows whic is in form of sticker behind that laptop got blurred , i want to know serail key and which version of windows it belongs to call me at < Phone number removed by VM >

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