Consider n(U) = 80. n(A) = 40. n(B) = 55 and $n(A \cap B)$ = 20 . Then the value of $n(A\oplus B)$ is:

Consider n(U) = 80. n(A) = 40. n(B) = 55 and $n(A \cap B)$ = 20 . Then the value of $n(A\oplus B)$ is:
1). 25
2). 55
3). 45
4). 35

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