The Official IQ Questions Thread
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Originally posted by skythewood:
Two planes take off at the same exact moment. They are flying across the Atlantic. One leaves New York and is flying to Paris at 500 miles per hour. The other leaves Paris and is flying to New York at only 450 miles per hour ( because of a strong head wind ). Which one will be closer to Paris when they meet?
The fireball of the explosion from the two planes colliding will be slightly closer to Paris...
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ferry wolf, chicken and rice across river. can only carry 1 at a time.
go
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uhh if your question is wolf eat chicken and chicken eat rice...
Ferry chicken over, come back for rice, bring chicken back to the original location and bring wolf over, come back for chicken...END -
last one...
ALBERT EINSTEIN'S RIDDLE
1. In a street there are five houses, painted five different colours.
2. In each house lives a person of different nationality
3. These five homeowners each drink a different kind of beverage, smoke different brand of cigar and keep a different pet.
THE QUESTION: WHO OWNS THE FISH?
HINTS
1. The Brit lives in a red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The Green house is next to, and on the left of the White house.
5. The owner of the Green house drinks coffee.
6. The person who smokes Pall Mall rears birds.
7. The owner of the Yellow house smokes Dunhill.
8. The man living in the centre house drinks milk.
9. The Norwegian lives in the first house.
10. The man who smokes Blends lives next to the one who keeps cats.
11. The man who keeps horses lives next to the man who smokes Dunhill.
12. The man who smokes Blue Master drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The man who smokes Blends has a neighbour who drinks water.google the answer to this one if you want to know the answer....
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This is like a sudoku puzzle.
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imagine you are in a game show. the host show you 3 doors, 2 leading to a goat, 1 leading to a car. if you choose the car, you get to keep it. after you choose a door, the host will open one of the door with the goat, and you will than have the option to switch to the other door.
will you stay with the same door?
choose the other door?
or it doesn't matter?
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it does not matter there is no reward at all.
the game show is just a scheme of getting ur participating fees and tv ratings.
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true... let's say you get the car if you happen to choose the car, and want to maximise your chances.... i go edit...
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Originally posted by skythewood:
true... let's say you get the car if you happen to choose the car, and want to maximise your chances.... i go edit...
Change to maximize your chance! -
now monty hall probability also come up.
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skytheword,
would appreciate if you can explain the rat solution in greater details.. thanks.. i dont understand.. :(
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skythewood... if the host have to open one door with goat as a rule...the percentage of you getting the car will become 50%....
However(which I think you mean this way), if after you choose a door did the host decide to give you the chance...yes I will change...it thes monty thing.... -
eH!
why got monty hall?
hahaha
change la.
should change.
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i post one easy one
every couple in country A wans to a boy.
they will keep making kids until they get a boy la, i.e if they get a girl den they continue until they finally get a boy.
now, wad's the proportion of boys to girls in country A.
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Originally posted by Three3am:
skytheword,
would appreciate if you can explain the rat solution in greater details.. thanks.. i dont understand.. :(
ok, let's say got 1 rat, 2 bottles, A, B
rat drink A. if rat dies, A is poison. rat live, B is poison.
two rats, 1 ,2, four bottles, A, B, C, D.
| A | B | C | D
rat 1 | drink |drink | |
rat 2 | drink | |drink |if rat 1 dies, means B is poison.
If rat 2 dies, means C is poison.
If both die, means A is poison
If both live, means D is poisonthree rats, 1, 2, 3, eight bottles, A, B, C, D, E, F, G, H
| A | B | C | D | E | F | G | H
rat 1 | drink |drink | | | drink |drink | |
rat 2 | drink | |drink | | drink | |drink |
rat 3 | drink | | | drink | |drink |drink |if rat 1 dies, means B is poison.
If rat 2 dies, means C is poison.
If rat 3 dies, means D is poison.
If 1, 2 dies, means E is poison
If 1, 3 dies, means F is poison
If 2, 3 dies, means G is poison
If all lives, means H is poison
If all dies, means A is poisonconclusion
so 1 rat can test 2 bottles,
so 2 rat can test 4 bottles,
so 3 rat can test 8 bottles,
so 4 rat can test 16 bottles,
so 5 rat can test 32 bottles,
so 6 rat can test 64 bottles,
so 7 rat can test 128 bottles, -
Originally posted by darkensun:
skythewood... if the host have to open one door with goat as a rule...the percentage of you getting the car will become 50%....
However(which I think you mean this way), if after you choose a door did the host decide to give you the chance...yes I will change...it thes monty thing....3 doors, two goat, 1 car.
if you choose randomly at the beginning, your chances of getting a goat is 1/3.
there is a 2/3 chance you won't get a car.now, let's say the host remove one of the goat.
there is a 2/3 chance that the door left is a car.
there is still a 1/3 chance you have chosen a goat.so it is better to switch.
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Originally posted by ChoCoChips:
i post one easy one
every couple in country A wans to a boy.
they will keep making kids until they get a boy la, i.e if they get a girl den they continue until they finally get a boy.
now, wad's the proportion of boys to girls in country A.
assume each birth is independent. assume there is 32 pair of couples
1st birth
chances of getting a boy and stop is 50% ==> 16
chances of getting a girl and try again is 50% ===>162nd birth
chances of getting a boy and stop is 50% ==> 8
chances of getting a girl and try again is 50% ==> 83rd birth
chances of getting a boy and stop is 50% ==> 4
chances of getting a girl and try again is 50% ==> 44th birth
chances of getting a boy and stop is 50% ==> 2
chances of getting a girl and try again is 50% ==> 25th birth
chances of getting a boy and stop is 50% ==> 1
chances of getting a girl and try again is 50% ==> 1as shown, number of boys and girls are the same.
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Originally posted by skythewood:
3 doors, two goat, 1 car.
if you choose randomly at the beginning, your chances of getting a goat is 1/3.
there is a 2/3 chance you won't get a car.now, let's say the host remove one of the goat.
there is a 2/3 chance that the door left is a car.
there is still a 1/3 chance you have chosen a goat.so it is better to switch.
i dun buy that.. haha.. i choose to think it's 50-50.. stats and prob is full of crap sometimes..
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Originally posted by purpledragon84:
i dun buy that.. haha.. i choose to think it's 50-50.. stats and prob is full of crap sometimes..
if you don't switch, the chance of you winning will always be 1/3.
even if you think stats is crap, you will have to agree with me on that, right?
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Originally posted by skythewood:
assume each birth is independent. assume there is 32 pair of couples
1st birth
chances of getting a boy and stop is 50% ==> 16
chances of getting a girl and try again is 50% ===>162nd birth
chances of getting a boy and stop is 50% ==> 8
chances of getting a girl and try again is 50% ==> 83rd birth
chances of getting a boy and stop is 50% ==> 4
chances of getting a girl and try again is 50% ==> 44th birth
chances of getting a boy and stop is 50% ==> 2
chances of getting a girl and try again is 50% ==> 25th birth
chances of getting a boy and stop is 50% ==> 1
chances of getting a girl and try again is 50% ==> 1as shown, number of boys and girls are the same.
correct!
fwah u ish smart boy!
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haha, thank you..
think detached and friends is busy, that's why they never answer your Q
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an eye opener..
http://math.ucr.edu/~jdp/Monty_Hall/Monty_Hall.html
haha..
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ai yo let me try
got 12 balls
break into 2 groups
6 balls each for both group A and group B. Weigh both groups
this take any random ball and weigh.
there u weighed 3 times le.
the random ball multiply by 6, if the weight exceeds the weight of both group A and B then its the extra ball, its the same if its weight is less than both groups.
however if its weight when multiplyed by 6 is exactly the same as one of the groups, it is the weight of one of the 11 balls.
Then you can multiply it by 5 and use the latter group multiplied by 6 to minus the answer, thus u get the answer of the extra ball.TADA!!
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Originally posted by purpledragon84:
an eye opener..
http://math.ucr.edu/~jdp/Monty_Hall/Monty_Hall.html
haha..
yup... switching is basically betting that you will not pick the car.
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there are 2 types of people on an island, heroes and villians.
you met a local, A, but did not hear what he says.
B, another local says "A just said that he is a villian"
C, another local says "he is lying! A is a hero!"
the question is, whether C is a villian or a hero.