The question is stated correctly, I believe the mix up is in the part about triviality. > “Non-trivial” means here that there is some number of blue dots for w

The question is stated correctly, I believe the mix up is in the part about triviality. > “Non-trivial” means here that there is some number of blue dots for which the statement would not have been true. I think this is supposed to say "Trivial means..." If there were 98 blue dots, your statement would not have been true, so it was trivial information. Essentially, if the people of dot town can figure it out themselves, then you've given them a trivial piece of information. They know there aren't 98 blue dots, because they can already see that for themselves.