Ononot — Let \chiA(x) be the characteristic function of a set A, defi

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Set Theoryhard

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Let $\chi_A(x)$ be the characteristic function of a set $A$ , defined as $\chi_A(x) = 1$ if $x \in A$ and $\chi_A(x) = 0$ if $x \notin A$ . Which of the following expressions is equivalent to the characteristic function of the symmetric difference, $\chi_{A \Delta B}(x)$ ?