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Each of 30 students studies at least one of the three [#permalink]
30 Jul 2008, 18:08
Each of 30 students studies at least one of the three languages, English, French, and Italian. If 17 students study English, 13 students study French, and 20 students study Italian, what is the least possible number of the students who study all three languages? (A) 0 (B) 4 (C) 6 (D) 7 (E) 10