If A = {1,2,3,4} and B = {2,3,6,7}.
then, A u B = {2,3} is false
The union of two sets A and B is a set containing the elements in set A or B.
The given sets are:
A = {1,2,3,4}
B = {2,3,6,7}
A u B is the set of elements in A or B
Therefore, A u B = {1, 2, 3, 4, 6, 7}
Note that:
A ∩ B = {2, 3}, it is not A u B
Therefore, A u B = {2,3} is false
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