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Consider the following in respect of two...

Consider the following in respect of two events A and B : 1. P(A occurs but not B ) `= P(A) - P(B)` if ` B sub A`. 2. P(A alone or B alone occurs)` =P(A)+P(B)-P(AnnB)`. 3. `P(A uu B) = P(A) +P(B)` if A and B are mutually exclusive . Which of the above is/are correct?

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