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  4. If A = 1, 2, 5 and B = 3, 4, 5, 9, then A Δ B is equal to

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Q. If A = {1, 2, 5} and B = {3, 4, 5, 9}, then $A \Delta B$ is equal to

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Solution:

$A \Delta B = (A - B) \cup (B - A)$
$= \{1, 2\} \cup \{3, 4, 9\}$
$= \{1, 2, 3, 4, 9\}$