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Brain Games - dare to enter ?

Hotpeppa said:
ok one more !

this is too easy...

here it is !

the brain buster of the century... are you ready for it ! ?



A great number of birds sit randomly spaced on a wire, each watching its nearest neighbour: Not counting the two birds on the end of the wire, what percentage of the birds sits unwatched ?
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If they are all looking at their nearest neighbour, then the percentage is close to zero.
 
ring sting said:
If they are all looking at their nearest neighbour, then the percentage is close to zero.
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Fifty percent of the birds will be watched by one other bird, and another 25 percent will be watched by two other birds. That leaves 25 percent unwatched.

:lol:
 
Anyone who gets this will be in the ranks of genius...lol

There are nine people in your circle of friends, and you want to invite them to dinner, three at a time, over the next twelve Saturdays. Is there a way to arrange the invitations in suck a way that pairs of friends meet each other at your dinners just once ?

this one took me one week..... who can solve this ?
 
How about this one:

Three men are having an argument in the 19 century, and decided to settle it with a good old fashioned shootout. Normally this would be a duel, but with three men, it becomes a truel. Lets call the men Mr's White, Grey, and Black. Mr White is a bad shot, hitting what he aims at 1 out of every 3 shots. Mr Grey is average, hitting it 2 out of 3 times. Mr Black is the best shot, hitting whatever he shoots at. To even things up, they agree to let Mr White shoot first, followed by Mr Grey, then Mr Black.

Who should Mr White shoot at first?
 
Hotpeppa said:
Fifty percent of the birds will be watched by one other bird, and another 25 percent will be watched by two other birds. That leaves 25 percent unwatched.

:lol:
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Reason for this?
 
because each bird is only "watching" in one direction - not all to the left or right, so there is a chance of any bird being watched by neither adjacent bird.

dreamboat
 
dreamboat said:
because each bird is only "watching" in one direction - not all to the left or right, so there is a chance of any bird being watched by neither adjacent bird.

dreamboat
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"there is a chance" isn't the same as "25% aren't watched".
 
McGoo said:
How about this one:

Three men are having an argument in the 19 century, and decided to settle it with a good old fashioned shootout. Normally this would be a duel, but with three men, it becomes a truel. Lets call the men Mr's White, Grey, and Black. Mr White is a bad shot, hitting what he aims at 1 out of every 3 shots. Mr Grey is average, hitting it 2 out of 3 times. Mr Black is the best shot, hitting whatever he shoots at. To even things up, they agree to let Mr White shoot first, followed by Mr Grey, then Mr Black.

Who should Mr White shoot at first?
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i know this is wrong but here's my guess...

Mr White is shooting at a 33.33 percentage rate on his targets,
Mr Grey is shooting at a 66.66 percentage rate on his targets,
Mr Black is is shooting a 99.99 percentage rate on his targets..

so the logical thing for Mr White to do is to take his 33.33 chance and aim for Mr Black increasing his chances of survival from Mr Grey's 66.66 precentage of accuracy giving him a 33.33 precent of survival....
 
Hotpeppa said:
i know this is wrong but here's my guess...

Mr White is shooting at a 33.33 percentage rate on his targets,
Mr Grey is shooting at a 66.66 percentage rate on his targets,
Mr Black is is shooting a 99.99 percentage rate on his targets..

so the logical thing for Mr White to do is to take his 33.33 chance and aim for Mr Black increasing his chances of survival from Mr Grey's 66.66 precentage of accuracy giving him a 33.33 precent of survival....
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He could, but no, thats not his best shot.
 
What he should do is get the other two blokes to stand beside each other and shoot one of them in the head. The projectile (assuming a decent calibre) would make the first dudes head blow up like a watermelon and would still retain enough kinetic energy (given that it is jacketed and not hollow point) to put a nice hole in the other dudes head.

Voila! It aint rocket science!!
 
If I throw a brick at 20km per hour in the vacuum of space, would the brick continue on at that speed forever or would it slow down???

P.S. allowing that it's not going to hit any hard objects or be influenced by any gravitation fields.....

Any thoughts
 
Yah i think it would continue at the same speed MoyBoy. For every action there is an equal and opposite reaction.
No friction in space.
 
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