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Mathematics for IGCSE & O level - Sets (Section 2 - No. 24)

If A = {1, 2, 3} and B = {2, 3, 4, 5}, which number is NOT an element of A ∪ B?
1
3
4
6

Erläuterung

The union of these sets includes all the listed numbers, up to 5.

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