In a class of 80 students, 50 students know english, 55 know french and 46 know german language, 37 know english and french, 28 students know french and german, 15 students know english and german, 7 students know none of the language. then (i) how many students know all the 3 languages? (ii) how many students know exactly 2 language? (ili) how many know only one language?
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the ans is 5
..........hope it helps
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