Premise: A man is skiing down a mountain with another large mountain behind him and a river between the mountains .
Correct statement: It is impossible that a man is skiing down the mountain to get help .
Incorrect statement: We believe that a man is skiing down the mountain to get help .
Correct statement: Chances are about even that a young man skiing down a mountain at night .
Incorrect statement: It is certain that a young man skiing down a mountain at night .
Correct statement: It is impossible that man trying to outrun an avalanche on a snowy mountain .
Incorrect statement: There is a very good chance that man trying to outrun an avalanche on a snowy mountain .
Correct statement: It is impossible that a man is commiting suicide the only way he knows how : skiing .
Incorrect statement: Chances are about even that a man is commiting suicide the only way he knows how : skiing .
Correct statement: There is a better than even chance that the man is very great at skiing .
Incorrect statement: There is almost no chance that the man is very great at skiing .