Think logically to solve this riddle.
A cruel king was giving his prisoner a chance to escape.
In order to escape he had to pick the yellow marbles out of a black jar.
The king was so cruel that he put two green marbles in the jar instead of one yellow and one green.
The prisoner still escaped safely, how did he do it?
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The prisoner picks a marble and without showing it to anyone swallows it.
Then he takes out the other marble and shows it to everyone.
Since the second marble is green , the marble that the prisoner chose has to be yellow.
So the king has no option but to let the prisoner go.