Question 1195974
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;P = {{{17/(17+20)}}} = {{{17/37}}}.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>



<U>Explanation</U>.  &nbsp;&nbsp;You reduce the space of events to &nbsp;17+20 = 37 &nbsp;persons,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;since it is &nbsp;GIVEN &nbsp;that the selected audience member is a person from the class.



Solved.