in discussion Discussion Forum / Subject Questions » A question on probability

See this link http://jfmueller.faculty.noctrl.edu/crow/prob%20teasers.pdf .

0.33 seems right according to that logic, and 0.5 seems right according to this. Obviously both cannot be right so I am making some wrong assumption somewhere, or maybe I have misinterpreted the question?

Also, can you explain the importance of the phrase 'at least' as mentioned in the second question in the wikipedia article? I do not understand the wrong assumptions that have been made based on that…

I'ts nicer to study probability like this than from the textbook :)