Ever notice how captcha is often accepted even though you clearly selected the wrong squares? Or it is rejected even though you clicked the stupid sign? I believe captcha machine learning works in a democratic manner in which the most commonly selected answers are considered correct.

If this is true and each submission is tallied as a "vote" for the correct answer, then compared to the majority of answers to determine if it conforms, what will happen if we always submit the first three images, left to right, as the answer? Can we eventually train the bot to accept this answer for a majority of captchas?

>select first three images in captcha
>submit
>repeat until it accepts the captcha

This actually worked after about 20 submissions even though I was not selecting the image correctly.