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What will be the Probability of the occurrence of at least one of the n independent events of a random experiment.

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If P1, P2, P3, ..., Pn are the probabilities of the happening of ‘n’ independent events, then the (probability that at least one of the events must happen) 

                    = 1 – Probability of failure of all events 

                   = 1 – (1 – P1) (1 – P2) (1 – P3) … (1 – Pn)

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