Received this via email today: I have just found the PL/SQL Challenge and I am eager to get started. Under Instructions on the Quiz Introduction page is something to which I would like to call your attention. "For most quizzes, however, it is possible that more than one choice is correct, that all choices are correct, or that none of the choices are correct. You must check at least one box from those offered before you can submit your answer." How might one check a box and then submit if none of the choices are correct? On first reading, I groaned. Really? Did I really leave a big hole like that in our quiz-taking process or - not quite as alarming - in my text? Is that a contradiction? No! No! No! There is an explanation which leaves me firmly on the right side of Logic. Can you see what it must be? I will post this first as a small logic puzzle via Twitter, then I will update this post in a day or two with my answer.
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