In a class of 80 students, 50 students know English, 55 know French and 46 know German
language.37 students know English and French, 28 know French and German and 25 students
know English and German.7 students know none of the languages. Find out
i. How many students know all the three languages (4 Marks)
ii. How many students know exactly 2 languages (1 Mark)
iii. How many students know only one language
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