Let R be the relation on the set of all real numbers defined by a R b iff |a-b| ≤ 1. Then, R is (...

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Let R be the relation on the set of all real numbers defined
by a R b iff |a-b| ≤ 1. Then, R is
(1) Reflexive and symmetric
(2) Symmetric only
(3) Transitive only
(4) None of these

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