Suppose 100 out of 120 Computer Science students study at least one of the following languages: French, German, and Russian. It is given that 65 students study French, 45 students study German, 42 students study Russian, 20 students study French and German, 25 students study French and Russian and 15 students study German and Russian. We want to find the number of students who study none of the three languages.
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out of 100 :68 students speak another language
and if answer has to given form 120 then it is 88
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