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If A and B are two events, the probability that exactly one of them occurs is given by

Monjur Alahi

If A and B are two events, the probability that exactly one of them occurs is given by
A. `P(A) + P(B) - 2P(A nn B)`
B. `P(A nn barB) + P(barA nn B)`
C. `P(A uu B) - P(A nn B)`
D. `P(barA) + P(barB) - 2P(barA nn barB)`


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Salim Ahmed Kawsar

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Correct Answer - A::B::C::D
We have,
P(exactly one of A, B occurs)
`= P [(A nn barB) uu (barA nn B)]`
`=P(A nn barB) + P(barA nn B)`
`=P(A) - P(A nn B) + P(B) - P(A nn B)`
`=P(A) + P(B) - 2P(A nn B)`
`=P(A uu B) - P(A nn B)`
Also,
P(exactly one of A, B occurs)
`=[1 - P(barA nn barB)] - [1 - P(barA uu barB)]`
`=P(barAuubarB) - P(barA nn barB) = P(barA) + P(barB) - 2P(barA nn barB)`

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