SOLUTION: A new computer virus can enter the system through the e-mail or through the internet. There is 30% chance of receiving this virus through the e-mail. There is a 40% chance of recei

Question 555507: A new computer virus can enter the system through the e-mail or through the internet. There is 30% chance of receiving this virus through the e-mail. There is a 40% chance of receiving it through the internet. In addition, 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?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
A venn diagram will help understand this.
.15 both e-mail and internet
.15 e-mail only
.25 internet only
----add
.55 total
.
1-.55=.45 the probability that the virus does not enter the system at all.
.
Ed
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