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Q.) 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 how many students know all the three languages?

(A) 73
(B) 72
(C) 50
(D) 54
Correct answer : Option (A) - 73

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