In http://www.makeuseof.com/tag/wanted-captchas-afraid-technology-explained/ James Bruce explains about Google’s reCaptcha project
It presents the user with TWO words – one of which is known. The system assumes that if the user correctly types the known word, then the chances are that the unrecognisable word is also correct.
But my question is suppose if I intentionally entered the second word wrong what would the system do?
Consider following conditions:
a) If I am the first one to pose that word , what will it do if second one also enters wrong word .
b)If I am the second one and enters wrong word.
How many iterations the system typically takes to decide/recognize a word ?