Question 1207900
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D U P L I C A T E 


Just solved at this forum under this link


https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1207901.html



Does any tutor doubt that this person is simply collecting (or checking) solutions for some 
problems book or for some web-site - - - not for learning ?