Brain teasers

[dustystreet]

she's like a dinner party with fnaar, zippy, waffles and me but wouldn't enjoy a meal with the rest of you!

 

[jonny jeez]

You change. If you don't change your chance of winning is 33%; if you do change then it's 50%.

not if, in your own mind, you decide to "re-choose" the original door!! eh...eh


How about this

You are standing at the North Pole (true pole), what is the name of the island that is directly 37 degrees west of you?

 

[dustystreet]

the arctic circle?

 

[jonny jeez]

the arctic circle?

nope...an Island.

 

[dustystreet]

hmmm, there is no west, every direction's south!

 

[jonny jeez]

hmmm, there is no west, every direction's south!

correct-a-mundo

 

[dustystreet]

which is why i thought you meant the artic circle cos it's in every direction. i know it's not island mind!

 

[swee'pea99]

A bloke was born before his father, killed his mother and married his sister - all legally.
How come
His dad was there when his mother died in childbirth. He later, as a vicar, married his sister to a bloke named Ron.

 

[Over The Hill]

You change. If you don't change your chance of winning is 33%; if you do change then it's 50%.

Spot on - You win the prize!

The original door has a 1 in 3 chance of being right and this is unaffected by the vacant door being opened (you already know one or other is vacant.

BUT by the vacant door being opened it makes the other door now a 1 in 2 chance. The chance is increased by the fact that only a vacant door will be revealed. That increase is not carried across to the original choice.

If you think of the process being repeated with 10 doors instead of 3 you see your chance increase each time a door is opened but only if you change doors.

 

[Over The Hill]

Without googling or looking at a map-

Name the states of the USA that are the furthest north south east and west.

 

[dustystreet]

n = ohio
s = texas
e = massachussetts
w = hawaii

 

[BrumJim]

n = Alaska
s = Florida, including the Keys (second guess is California)
e = Massachussetts
w = Hawaii

 

[Over The Hill]

n = ohio
s = texas
e = massachussetts
w = hawaii

0/4 !

 

[marinyork]

Maine has got to be the furthest east although if PR was a state (which its not it'd give it a run for its money).

 

[Over The Hill]

n = Alaska
s = Florida, including the Keys (second guess is California)
e = Massachussetts
w = Hawaii

1/4 But which one?