100 candidates sat for a examination ,60 pass bio,50 pass che and 29 pass phy. all passed atleast on

100 candidates sat for a examination ,60 pass bio,50 pass che and 29 pass phy. all passed atleast one of theree subjects, 17 pass both bio and che, 15 pass both bio and phy and 12 pass both che and phy. Draw a venn diagram to illustrate the problem.
if a candidate is chosen at random, what is the probability that he pass exacty one subject?

 

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