If A={1,2,3,4,} and B={3,4,5}, then the number of elements in (A ∪ B) X (A ∩ B) X (A∆B) is

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If A={1,2,3,4,} and B={3,4,5}, then the number of elements in (A ∪ B) X (A ∩ B) X (A∆B) is
(a) 18
(b) 20
(c) 24
(d) 30
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