IQ Question:

You have 13 balls.
One of them weighs different from all the rest. It could be heaver, or it could be lighter. No one knows.

You have a balancing scale (like a see-saw, either both sides equal, or one up and the other down) that can only be used 3 times.

Find the odd ball.
*REMEMBER: You don't know if the odd ball is heavier or lighter.

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