[Denman]

ok ok enough debate
the answer is 1/3




Right, 4 possiblities, as most of you got

boy/girl
girl/boy
boy/boy
girl/girl
from genetics
but if you find its a girl, you only eliminate one of them (boy/boy) not 2.
thus the probability - 1/3 (2 where the other is a boy and 1 where other is a girl) .

i quote an answer someone else wrote
You know that they have two children, that is four possibilities (Boy-Boy, Girl-Boy, Boy-Girl and Girl-Girl). Because you know that one of them is a girl, the first possibility is ruled out. So the probability that the second one is a girl is 1/3.


Another one :
Three cowboys are fighting together in a meadows. The first one, John, is a good shooter, he kills his target 2/3 of the time, and miss one third of the time. The second, Slim, is an average shooter, whose chances to kill and miss or even. The third, Bob, is a poor shooter, he only kills his target 1/3 of the time. They look at one another in silence... They still look... Sweat starts pearling one their faces... OK. Anyway. Their rule is the following. They shoot in rounds. One shot per round. They always shoot at the best shooter but themselves. They do as many rounds as neccesary so that either they all die or only one remains alive. Who has the most chances to survive? (Thanks to Matthias for this one)

oh and joe, dont answer this one lol seeings as you probably know where to find the answer lol


A grandfather clock chimes the appropriate number of times to indicate the hour, as well as chiming once at each quarter hour. If you were in another room and heard the clock chime just once, what would be the longest period of time you would have to wait in order to be certain of the correct time?


Let us go into heroic fantasy land. The story takes place in a antic land where dwarves are mining to extract gold. The king is visiting the mine when he ears voices around the corner: "I have a neat trick: we have to melt gold bars the size of this mold, that is exactly 100 grams. I remove just a tiny fraction to all my bars and they all weight 99 grams. Their scales are not precise enough, they don't see anything..." The king tries to run after then, but they ear him and manage to flee among the corridors. Annoyed, the king summons the gods, who grant him a gift from the future: a digital scale. The digital scales works as follows: you put whatever you want on the scale, (nothing happens then), you press a button and the exact weight of what is on the scale appears. Then, the scale vanishes. Note that before you have pressed the button, no weight appears and once you have pressed the button the weight won't change even if you add or remove things. Armed with this mighty scale, the king summons all his 100 workers. How will he find the cheater?