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If Aa n dB are two events, the probabili...

If `Aa n dB` are two events, the probability that exactly one of them occurs is given by `P(A)+P(B)-2P(AnnB)` `P(Ann B )+P( A nnB)` `P(AuuB)-P(AnnB)` `P( A )+P( B )-2P( A nn B )`

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