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That story is used with the hope that it will make us appreciate the difference between lateral and logical thinking.
The girl put her hand into the moneybag and drew out a pebble. Without looking at it, she fumbled and let it fall onto the pebble-strewn path where it immediately became lost among all the other pebbles.
"Oh, how clumsy of me," she said. "But never mind, if you look into the bag for the one that is left, you will be able to tell which pebble I picked." Since the remaining pebble is black, it must be assumed that she had picked the white one. And since the moneylender dared not admit his dishonesty, the girl changed what seemed an impossible situation into an advantageous one.
MORAL OF THE STORY: Most complex problems do
have a solution, sometimes we have to think about
them in a different way.