How Google Adsense Detects Invalid Clicks?

[alec11]

when more than 5-6 click from the same ip google will know that these are fake clicks and there are no software to detect they detect according to the clicks got from the same ip

well thats not the case ,if any body will clcik 6 different ads from one ip google wont do anything but that should not be repeating and if you will read complete thread google has different tactics not only invalid clcik they track clicking patterns.

I don't think that's okay.
If google ads showing 100 ads in our site and we ask our friend to click all those 100 ads in a day, I believe our account will get banned before we can receive payment check