Each of the four inequalities given belo...

Each of the four inequalities given below defines a region in the xy plane. One of these four regions does nothave the following property. For any two points `(x_1,y_2) and (y_1,y_2)` in the region the piont `((x_1+x_2)/2*(y_1+y_2)/2)` is also in the region. The inequality defining this region is

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