Union of sets

Given the sets A = {2, 3, 4, 5} and B = {2, 4, 5, 6} . What is A ∪ B?
1.A ∪ B={2, 4, 5}
2.A ∪ B={3}
3.A ∪ B={2, 3, 4, 5, 6}
4.A ∪ B={6}

Correct answer:

x =  3

Step-by-step explanation:

AB={2,3,4,5,6} x=3



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