why a four-legged chair might rock from side to side even when the floor is flat, but a three-legged chair would not do this.
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Step-by-step explanation:
The stool legs could be uneven in length so that they match the uneven floor. However, assuming the stool legs are even, the four legged stool will rock because one of the legs will not reach the floor. The three legs that do reach the floor will hold the stool so the other leg cannot.
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