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Journey to the Center of the Earth Hints
Which ball is odd, if it is still heavy on the Right?
1 of 3: Your weighing was from the "light" left side (balls 1 & 2). If the result is even, it's easy to guess which is the "unique" ball. If not, you must choose between them by looking back at earlier weighings.
2 of 3: If EVEN, the answer is 6 (because it was originally heavy on the 1st trial and stayed that way during the 2nd).
3 of 3: If EITHER side is HEAVIER, pick the Light ball -- 1 or 2 (because it was always light)