Let={2,4,7},B={2,5,4} find the set A∆B

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Solution:

A △ B = (A – B) ∪ (B – A)

Given A={2,4,7},B={2,5,4}

A - B = {7}

B - A = {5}

Now, A △ B = (A – B) ∪ (B – A)

= {7} ∪ {5}

= {5,7}

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