The probability that an event \( A \) occurring is 0.5 and of \( B \) occurring is 0.3 . If \( A....

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The probability that an event \( A \) occurring is 0.5 and of \( B \) occurring is 0.3 . If \( A \) and \( B \) are mutually exclusive then probability of \( A \) nor \( B \) occurring is :
(1) 0.6 neitner (2) 0.5
(3) 0.7
(4) 0.2
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