15.6.26 Definition and Properties of Probability

Condition: There are 30 students in the group. Of these, 14 study French, 11-German language, 16-Japan, 6-French and German, 5-German and Japanese, 7-French and Japanese, and 4-all three languages. Determine the likelihood that an arbitrarily selected student: a) does not learn a single language: b) learns only two languages.