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Oct 15, 2019 at 20:23 comment added fectin @user304582 yes. But if you mark them, you can do it one at a time as you specified.
Oct 15, 2019 at 18:13 comment added user304582 Yes, part of my question is the assumption that you must return each ball to the urn after examining it. As you point out, if you are able to remove all balls from the urn at once, then you will (almost certainly) be able to distinguish between A and B.
Oct 14, 2019 at 21:55 review First posts
Oct 15, 2019 at 1:23
Oct 14, 2019 at 21:51 history answered fectin CC BY-SA 4.0