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A rectangular floor is covered by a rug except for a strip P meters wide along each of the four edges. If the floor is m meters by n meters, what is the area of the rug, in square meters?

A rectangular floor is covered by a rug except for a strip P meters wide along each of the four edges. If the floor is m meters by n meters, what is the area of the rug, in square meters? Correct Answer (m - 2p)(n - 2p)

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