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Question

Let A={1,2,3,4}, B={2,3,4,5,6}, then A Δ B=

A
{2,3,4}
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B
{1}
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C
{5,6}
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D
{1,5,6}
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Solution

The correct option is D {1,5,6}
A Δ B=(AB)(BA)
AB={1,2,3,4}{2,3,4,5,6}={1}
BA={2,3,4,5,6}{1,2,3,4}={5,6}
A Δ B={1}{5,6}={1,5,6}

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