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Let the set A is {1, 2, 3} and B is {2, 3, 4}. Then the number of elements in A U B is?

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Let the set A is {1, 2, 3}  and B is {2, 3, 4}. Then the number of elements in A U B is?

(a) 4

(b) 5

(c) 6

(d) 7

The question was posed to me in semester exam.

I need to ask this question from Set Operations topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Correct option is (a) 4

Best explanation: AUB is {1, 2, 3, 4}.

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