Riddle Me This
Posted 04 January 2007 - 02:57 PM
technically there's 3 answers
- 9:00 a.m. (because i said at the same time...so the train would wait till 9 to leave)
- 6:00 a.m (because at 9:00 a.m. in New york it's 6 am in L.A. and if they left at the exact same time and not at the same time on a clock )
- what train? i don't see no train?
Posted 04 January 2007 - 03:25 PM
There is one light bulb in a room, and three light switches outside the room. You are outside, and want to know which switch match with the light bulb. You can only travel into the room once, and cannot come back in again. You can not see a light shine if you are not in the room. You can do anything you want upon entering the room. How can you set the situation so that you will know which switch goes with the light bulb?
Posted 06 January 2007 - 03:11 PM
what happens with a lightbulb when it is switched on. Beside it gives light.
You can not see a light shine if you are not in the room.
This may be a bit confusing. I meant to say that you can't recognize the light of the lightbulb when you are outside the room, but you see the switches and the room without the light of the lightbulb.
Edited by Thunderbird1988, 06 January 2007 - 03:12 PM.
Posted 06 January 2007 - 03:28 PM
You turn on one light switch and leave it on for a few minutes. Then you turn it off, and turn on another one and walk in the room. The one that was on for a few minutes would be hot/warm, and then there would be one that is on, and then one that is off. That would let you know which is which.
Posted 06 January 2007 - 03:43 PM
There was a green house.
Inside the green house there was a white house
Inside the white house there was a red house.
Inside the red house there were lots of babies.
What is it?
Posted 06 January 2007 - 05:10 PM
You are up!
Posted 06 January 2007 - 05:20 PM
Lets Try This One
A large tribe obeys a strict reproductive custom.
All families continue having children until they have a girl,
and then they stop having more children.
Assume it is equally likely for a given birth to produce a girl or boy,
and assume families can have any number of children
so they always do get one girl eventually.
In the 10th generation, what is the expected ratio of males to females?
Also, what is the expected population size of the 10th generation relative to the 1st?
Posted 13 January 2007 - 04:48 AM
Well here is the Answer to This Riddle
The male to female ratio is 50/50. The odds of each new baby are always 50/50, and a rule for when families stop having children does not affect those odds.
The population size also stays the same, because there are 2 children per family on the average. They all have 1 girl, and the boy/girl ratio is 50/50 so they must also have an average of 1 boy.
Another way to calculate this is as follows: All families have 1 girl. Prior to that, 1/2 of the families also have at least one boy, 1/4 have another boy, 1/8 have another, etc. The sum of the series (1/2 + 1/4 + 1/8 + 1/16...) equals 1. So on the average its just 1 girl and 1 boy.
So anyone can Post a Riddle now
Posted 26 January 2007 - 01:16 PM
Before Mount Everest was discovered,
what was the highest mountain on Earth
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