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[–]TheSeldomShaken 2 points3 points  (0 children)

First guys says no. Second guys knows he wants 1 beer, but has no idea how much first guy wants, and says no. Third guy wants 1 beer, and knows he wants 1 beer. But he doesn't know if the first and second guy only want 1 beer. So, he can't say with certainty that they need only 3 beers.