Question 1143881
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Suppose two vaccum salesmen A and B must each make two calls per day, one in the morning and one in the afternoon. 
A has a probability 0.4 of selling a cleaner on any call, while B(a novice) has a probability 0.1 of a sale. 
A works independently of B, and for each salesman, morning and afternoon results are independent of eachother. 
Find the probability that

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       A. A sells {{{highlight(cross(just))}}} <U>exactly</U> one cleaner <U>during the day</U>.
       B. B makes at least one sell <U>during the day</U>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Please pay attention on how I edited your post to make it clean and clear.



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(A)  P = P(sells at least one during the day) - P(sells two during the day) = (0.4 + 0.4 - 0.4*0.4) - 0.4*0.4 = 0.64 - 0.16 = 0.48.


(B)  P = complement to two unsuccessful calls = 1 - 0.9*0.9 = 0.19.
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