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Module 1: Sets, Relation and Function.

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Let N={1,2,3,......}N = \{1,2,3,......\} be ordered by divisibility, which of the following subset is totally ordered
(i) {2,6,24}\{2, 6, 24\}
(ii) {3,5,15}\{3, 5, 15\}
(iii) {2,9,16}\{2, 9, 16\}
(iv) {4,15,30}\{4, 15, 30\}

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