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A king is hosting a party and has got an information that 
one out of the four bottles of wine contains poison.
He has four prisoners to be hanged next day.
But he wants to try with minimum number of prisoners.
How many numbers of prisoners does he need to find the exact poisonous bottle?
He needs just one prisoner. King can ask one prisoner to keep on drinking wine bottles one after another until he consumes poisonous wine. If he is alive even after consuming first three bottles, fourth bottle is poisonous and it would depend on King if he still wants prisoner to drink last bottle.