Mathematics, 16.09.2019 19:20, ejcastilllo

Anew computer virus can enter the system through e-mail or through the internet. there is a 30% chance of receiving this virus through e-mail. there is a 40% chance of receiving it through the internet. also, the virus enters the system simultaneously through e-mail and the internet with probability 0.15. what is the probability that the virus does not enter the system at all?

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Anew computer virus can enter the system through e-mail or through the internet. there is a 30% chan...