If the events are said to be independent, if the occurrence or non occurrence of one does not affect the probability of the occurrence or non occurrence of other.
Both events A and B will occur
ii. (1–p1) p2
Event A does not occur but event B occur.
At least one of the event will occur
iv. p1+p2 = 2p1p2
p1+p2 = 2p1p2
Exactly one of A and B occurs
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