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Chests (Posted on 2024-03-20) Difficulty: 3 of 5
You are in a room with 2N Plaminians and C locked chests. One of the chests contains a treasure. Half of the Plaminians are consecrated, and know which chest contains the treasure. The other Plaminians do not know which chest has the treasure. All of the Plaminians know which ones are consecrated. You do not know which Plaminians are consecrated, or which chest has the treasure.

The Plaminians have agreed that you may ask each one a yes/no question, and they will answer truthfully if they know the answer, and randomly if they do not know.

What sequence of questions will give you the greatest chance of locating the chest with the treasure? For what values of N and C is success guaranteed?

No Solution Yet Submitted by K Sengupta    
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Some Thoughts re: simulation Comment 4 of 4 |
(In reply to simulation by Charlie)

 It looks as if N doesn't matter, so I did a million trials for each value of C for N = 2:
 
  C 
  1    1000000 
  2     750023 
  3     500449 
  4     375174 
  5     300908 
  6     250458 
  7     214703 
  8     187100 
  9     166170 
 10     150223 
 11     135509 
 12     125152 
 13     115428 
 14     107128 
 15      99680 
 16      93708 
 17      87941 
 18      83675 
 19      79047 
 20      75050
 

  Posted by Charlie on 2024-03-20 13:44:45
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