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More ways to get Braingle...

A Problem With Pearls

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#48356
Fun:*** (2.87)
Difficulty:** (1.32)
Category:Probability
Submitted By:No_Eyed_FshAau****
Corrected By:b2b9800

 

 

 



"I'm a very rich man, so I've decided to give you some of my fortune. Do you see this bag? I have 5001 pearls inside it. 2501 of them are white, and 2500 of them are black. No, I am not racist. I'll let you take out any number of pearls from the bag without looking. If you take out the same number of black and white pearls, I will reward you with a number of gold bars equivalent to the number of pearls you took."

How many pearls should you take out to give yourself a good number of gold bars while still retaining a good chance of actually getting them?





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Comments

braingle100Aus*
Jan 03, 2011

'no I a not racist.' LOL
No_Eyed_FshAau*
Jan 03, 2011

This teaser was used in my recent WTB game, The Riddle Shop. No, it is not a riddle.
BrainBoggler*
Jan 13, 2011

easy................ if that was me, i would have been sooooooooooooooooooooooooo rich!!!!!
Stack1607A*
Jan 15, 2011

great teaser!
OpusthePenguin
Mar 21, 2016

The proposed answer assumes that one would rather have a 50% chance of winning 5000 gold bars than a 50.02% chance of winning a single gold bar. That's an accurate assumption in my case, but it does mean this isn't purely a probability problem.

Let's tweak the problem slightly. Keep the reward the same--one gold bar per pearl withdrawn. But let's add in a penalty. If you don't withdraw an equal number of black and white pearls, you die. In that case, I'd suggest withdrawing two pearls since that would (very slightly) increase your chance of remaining alive.



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