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Let S = {1, 2, 3, …, 10}. Suppose M is the set of all the subsets of S, then the relation R = {(A, B) : A ∩ B ≠ φ ; A, B ∈ M} is:

1. Reflexive only
2. Symmetric and tr
3. Symmetric only
4. Symmetric and reflexive only

Correct answer: Symmetric only

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