19. 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
students know French and German, 7 students know none of the
languages. Find out
(i) How many students know all the 3 languages ?
(ii) How many students know exactly 2 languages ?
(iii) How many know only one language ?
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