Let R be a relation from a set A to a set B, then
(a) R = A ∪ B
(b) R = A ∩ B
(c) R ⊆ A × B
(d) R ⊆ B × A
(c) R ⊆ A × BIf R is a relation from set A to set B, then R is always a subset of A × B.
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