Three logicians walk into a bar. The bartender asks "Do all of you want a drink?" The first logician says "I don’t know." The second logician says "I don’t know." The third logician says "Yes!"
@hhardy01 aha - each of them knows that if they personally are negative it makes the 'all' premise negative as well, so their uncertain response indicates they are themselves affirmative and only uncertain about the others. The third has no uncertainty left and can confirm! :)
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