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Question Number 120597 by fajri last updated on 01/Nov/20

$$$$$$\mathrm{Let}\mathrm{A}\ne -\varphi ,\mathrm{A}\mathrm{are}\mathrm{subsets}\mathrm{of}\mathrm{R}\mathrm{and}\mathrm{A}\mathrm{are}$$$$\mathrm{ope}n\mathrm{sets}.\mathrm{Then}\mathrm{each}\mathrm{p}\mathrm{member}\mathrm{A}$$$$\mathrm{applie}s...?$$

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