problem. Ann is a sales manager at a company and she works from 8:00 am to 4:00 pm with a 1 hour lunch break. The possible clients call her randomly between 8 am and 5 pm.  (b) Let assume that 10 possible clients call Ann in a day. (i) What is the probability that exactly 8 clients can speak with Ann?  (ii) What is the probability that Ann can speak with at least one client?  My question is, how do I solve this In the simplest way  and not poisson formula. in my university they teach us with (A union B ) format. please do reply ASAP. thank you

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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problem. Ann is a sales manager at a company and she works from 8:00 am to 4:00 pm with a 1 hour lunch break. The possible clients call her randomly between 8 am and 5 pm. 
(b) Let assume that 10 possible clients call Ann in a day.
(i) What is the probability that exactly 8 clients can speak with Ann? 

(ii) What is the probability that Ann can speak with at least one client? 

My question is, how do I solve this In the simplest way  and not poisson formula. in my university they teach us with (A union B ) format.

please do reply ASAP. thank you. 

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