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Answer & Explanation Solution: The prisoner picks a marble and without showing it to anyone swallows it and then picks the remaining marble and shows to everyone which was black which proved the first marble prisoner pick must be white.

The Mad King has no option but to let the prisoner go.

category : LOGIC | TRICK

The King Aerys known as "The Mad King" was the king of Iron Throne. There was a strange rule in the kingdom that every prisoner will be given a last chance before execution.A clever prisoner was wrongly accused by the King and was given a death penalty. As a rule, the prisoner was given a last chance in which prisoner must choose the white marble from a black box. As a rule, one black and one white marble must be placed in the box but the mad king placed both black marbles in the box.The prisoner survived. Explain?