Ononot — If n(A) = 20, n(B) = 30, and n(A \cup B) = 40, what is n(A \

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If $n(A) = 20, n(B) = 30$ , and $n(A \cup B) = 40$ , what is $n(A \setminus B) + n(B \setminus A)$ ?