>>>>There are three men on a deserted island.
>>>>The men on the island are either Red or Blue.
>>>>
>>>>Red people always tell lies.
>>>>Blue people always tell the truth.
>>>>
>>>>A ship comes to rescue them and the captain of the ships shoult to the men, "We will only rescue Blue people."
>>>>
>>>>Man A says, "I'm blue and those two are "red".
>>>>Man B says something but it was blown away with the wind.
>>>>Man C Says, "B said he's Blue. That's true. I'm blue too."
>>>>
>>>>Which of the three men should take if he wants just blue people and why?
>>>
>>>He should take B & C. A told the false (e.g. he is actually red and other two are blue). C said the truth.
>>
>>That's mostly correct, but what exactly about C's statement makes it the truth?
>
>Suppose, C is a liar.
>
>This would mean, that B said, he is Red. If B is Blue, he woud say, he is Blue. If he is Red, he would also say, he is Blue, so if C is a liar, he would say, that B said, he is Red.

Excellent, that is it.