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Originally Posted by Hotrootsoup
Math doesn't work because that's what computers do best.
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No, interpreting the phrasing of the problems is the test here, not the math.
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Asking a question requires a delay as a human has to check their answer.
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No, an algorithm can come up with the question and answers automatically, and again, interpreting the phrasing and presentation would be the test.
A spam program will eventually defeat these methods, but they will eventually defeat CAPTCHA as well. Machine vision, OCR and image processing are improving all the time.