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Draw Hasse Diagram of D42, Find the complement of each element in D42.
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D42={1,2,3,6,7,14,21,42}. The Hasse diagram is shown in fig. has the greatest element I=42 and least element O=1. Consider 1D42. Its complement be b . Then by definition lub(1,b)=I=42. This is true when b =42. Similarly by definition glb(l,b)=O=1,which is again true when b=42. Thus complement of 1 is 42, …

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