You are one of 30 prisoners on death row with the execution date set for tomorrow. Your king is a ruthless man who likes to toy with his people's miseries. He comes to your cell today and tells you:
“I’m gonna give you prisoners a chance to go free tomorrow. You will all stand in a row (queue) before the executioner and we will put a dot on your backs, either a white or a black one. Of course you will not be able to see the color of your own dot; you will only be able to see the prisoner in front of you with his dot; you will not be allowed to look back or communicate together in any way (talking, touching.....).
Starting with the last person in the row, the one who can see only one who is in front of him, he will be asked a simple question: WHAT IS THE COLOR OF YOUR DOT?
He will be only allowed to answer “BLACK” or “WHITE”. If he says anything else you will ALL be executed immediately.
If he guesses the right color of the dot on his back he is set free, otherwise he is put to death. And we move on to the one in front of him and ask him the same question and so on…
Now since you all can communicate freely during the night,how can you find a way to guarantee the freedom of 29 prisoners tomorrow?
Hello dear friends....
I`ll give you today the answer:
Two women,let us say,Anna and Berta, where widows, and good friends .each one has a son:
Anna.......her son called Anton
Berta......her son called Bert
each of them married the son of her friend.
Anna married Bert.........they got a baby...called Aby.
Berta married Anton.
now, Berta was carrying Aby...who is the son of her son(Bert).
and he is also her husband`s bother(from the same mother..Anna).
Thank you all....
Hi...
the lamps being on the square numbers of:1,2,3,4,5,6,7,8,9,and 10 will be on.
that means,,the lamp No. 1,,4,,9,,16,,25,,36,,49,,64,,81,,and 100.
and are only 10 lamps .
Hi...I am sure I added an answer... I`ll put it again..
I suppose to sink the sphere in water after drilling, it will remove water equal to its volume.