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Riddle: Twelve Balls, One Different

You have twelve balls, identical in every way except that one of them weighs slightly less or more than the balls.

You have a balance scale, and are allowed to do 3 weighings to determine which ball has the different weight, and whether the ball weighs more or less than the other balls.

What process would you use to weigh the balls in order to figure out which ball weighs a different amount, and whether it weighs more or less than the other balls?

Try weighing 8 weights to start with (4 on each side).

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