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I know some people that would fail a few of these questions...

• daten 16y ago
  I agree. The questions in the example may be easily solved by a technically minded person, but they could also confuse a large part of your audience. I would find it very difficult to generate questions that are appropriate no matter what language, culture, math or literacy background my visitors have.
• qntm 16y ago
  One could make a case for deliberately weeding such people out of whatever system the CAPTCHA is intended to protect.