A math question is a lot better than some of the other “I am not a robot” verification schemes used on some websites. The most annoying is where they show you a matrix of 9 or 12 photos and ask you to check each one that shows a certain item (e.g. airplane, car, etc.). Problem is that trying to see on a small screen divided into 9 small photos is just about impossible. After 3 incorrect guesses, you are locked out
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