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Question

If A={1,2} and B={3,4}, then AB = ___.

A
{}
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B
AB
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C
{1,2,3,4}
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D
BA
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Solution

The correct options are
C {1,2,3,4}
D BA
Given A={1,2} and B={3,4}.
AB={1,2,3,4}
Also, the commutative property of union of sets says that
AB=BA.

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