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Eight numbers are placed in the circles as shown above. Do you see a pattern in going from one number to the next as you follow the arrows?
What's the missing number?
Adapted with permission from Puzzles 101: A Puzzlemaster's Challenge by Nobuyuki Yoshigahara (translated by Richard Weyhrauch and Yasuko Weyhrauch). Copyright © 2004 by A K Peters, Ltd. See www.akpeters.com/book.asp?bID=198.
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