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?

Python. primary u. s. interstate highways are numbered 1-99. odd numbers (like the 5 or 95) go north/south, and evens (like the 10 or 90) go east/west. auxiliary highways are numbered 100-999, and service the primary highway indicated by the rightmost two digits. thus, the 405 services the 5, and the 290 services the 90. given a highway number, indicate whether it is a primary or auxiliary highway. if auxiliary, indicate what primary highway it serves. also indicate if the (primary) highway runs north/south or east/west.