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Archive for October, 2011

Girls only, part 2

Posted by Chris under Logic (23 Responds)

I have two children, at least one of them is a girl who was born on a Friday. What is the probability that they are both girls?
Assume that each child is equally likely and independently to be a boy or girl.
Now let the battle commence.

Girls only, part 1

Posted by Chris under Logic (32 Responds)

I know this is well known and almost certainly has been posted here before, you’ll see why I’m posting it when it comes to part 2.
I have two children, at least one of them is a girl. What is the probability that they are both girls?
As a few of you have brought it up, [...]

Ragknot faces execution

Posted by ragknot under Tom (8 Responds)

1. Ragknot waits on death row for framing some poor guy for car theft… very serious in these here parts. By custom, the night before a man is to be executed, he plays a game- either of chance or skill, it is the judge’s discretion. This game will decide whether the prisoner will indeed die, [...]

Shooting Craps (The dice game)

Posted by ragknot under Tom (10 Responds)

The gambling hall has now given me the right to play with my Strange Dice for the first roll. If I roll a 13, I can’t win with the regular dice. Should I try my Strange Dice? Will they give me a better chance to win more or less?
Craps Info————————
The player rolls [...]

Strange Die #2

Posted by ragknot under Tom (6 Responds)

The other die of the Strange Dice pair is different.
Half the time you roll a one, it appears as a two. The normal side two always appears as a two. What is the average number of rolls of the die to get each number (1 to 6) at least once?

Strange Die

Posted by ragknot under Tom (14 Responds)

Just like Chris’s #4 (previous post) but …
you have a strange die. Half the time you roll a six, it apprears as a seven. What is the average number of rolls of a die to have got each number (1 to 7) at least once?Знакомства

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