Riddle

1 poisoned bottle in 1000. Prisoners needed?

Choose an answer

A.1,000 prisoners
B.500 prisoners
C.1 prisoner
D.10 prisoners
Hint: It's a word with 9 letters, starting with "1".

Answer

10 prisoners

Why this is the answer

Give each prisoner a unique combination of bottles to sip from based on binary (0 and 1). The specific combination of prisoners who get sick creates a binary code for the poisoned bottle number.

This riddle is filed under Expert Riddles for Adults and rated Hard.