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If A and B are two events, then which ...

If `A` and `B` are two events, then which of the following does not represent the probability that exactly one of `A ,B` occurs is.
(a) `P(A) + P(B) - P(A nn B)`
(b) `P(A nn B') + P(A' nn B)`
(c) `P(A') + P(B') - 2P(A' nn B')`
(d) `P(A) + P(B) -2 P(A nn B)`

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