Telephone sales have skyrocketed this past month. The probability that 1 of the 4 telephone lines is busy is 75%. Therefore, currently the probability of all 4 lines being busy at the same time is about 32%. I want to reduce the probability of all telephone lines being busy at the same time. If I add 2 more telephone lines, how much do I reduce the probability of all telephone lines being busy at the same time? (Assume the probability that any telephone line is busy remains at 75%.)

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Thank you for the opportunity to help you with your question!

Thank you for the opportunity to help you with your question!

4phones = 32% one phone being busy is 8%

6 phone not busy= 32- 8 =24%

Please let me know if you need any clarification. I'm always happy to answer your questions.Please let me know if you need any clarification. I'm always happy to answer your questions.there is something that is not adding up