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i give you 12 marbles. 11 of them are identical. the 12th one looks the same, but is either heavier or lighter than the other 11.
you also have a balance scale. the kind that weighs things on both sides - and if one side is heavier, it tilts down.
you are allowed only 3 weighings.
tell me which ball is the oddball, and whether it is heavy or light.
you also have a balance scale. the kind that weighs things on both sides - and if one side is heavier, it tilts down.
you are allowed only 3 weighings.
tell me which ball is the oddball, and whether it is heavy or light.