I don't know but I thought it this way


#1

What if we announce a party for criminals and make the prisoners drink a sip from each bottle and number them accordingly, in that case, the answer could be just 1. I find it funny the way it’s even answered.


#2

King wants to minimize the number of prisoners involved in the experiment. In your case, it would involve 1000 prisoners which can be reduced to 9 according to the solution.


#3

@jewel-barman, very nice. I agree with your solution