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Write the formula for Inclusion-Exclusio...

Write the formula for Inclusion-Exclusion principle and suppose that 100 of 120 mathematics students was college take at least one of the languages French, German and Russian. Also suppose 65 study French 45study German, 42 study Russian, 20 study French and German, 25 study French and Russian 15 study German and Russian. Find the number of student studying all subjects. Also find studying exactly one subject.

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