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Question Number 186103 by MASANJAJJ last updated on 01/Feb/23

$$\mathrm{Let}\mathrm{R}\mathrm{denote}\mathrm{a}\mathrm{set}\mathrm{of}\mathrm{all}\mathrm{ordered}\mathrm{pairs}(\mathrm{x},\mathrm{y})$$$$\mathrm{of}\mathrm{integers}\mathrm{such}\mathrm{that}\mathrm{x}-\mathrm{y}\mathrm{is}\mathrm{an}\mathrm{integral}$$$$\mathrm{multiple}\mathrm{of}3.\mathrm{Which}\mathrm{of}\mathrm{the}\mathrm{followings}\mathrm{ordered}\mathrm{pairs}$$$$\mathrm{belong}\mathrm{to}\mathrm{R}(9,3)(3,9),(1,2)(1,5),(7,2)$$$$(0,4),(4,7).$$$$(\mathrm{note}:\mathrm{a}\mathrm{is}\mathrm{an}\mathrm{integral}\mathrm{multiple}\mathrm{of}\mathrm{b}\mathrm{if}\mathrm{a}=\mathrm{kb}$$$$\mathrm{whe}re\mathrm{k}\mathrm{is}\mathrm{an}\mathrm{integer})$$

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