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Given the probabilities of the series of independent events Ai (i = 1,...,5). The probabilities of event A1 is happening is 2/21;
The probabilities of event A2 is happening is 1/10;
The probabilities of event A3 is happening is 7/15;
The probabilities of event A4 is happening is 9/16;
The probabilities of event A5 is happening is 3/10.
What is the probability that at least one of the events will happen?

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