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In a group of hundred people each person speaks at least one of the languages Telugu, Kannada or Hindi. The numberof persons speaking only Teluguis 25, only Kannada is 15 and only Hindi is 35. 7 persons speak Telugu and Hindi only, 8 speak Telugu and Kannada only and 5 speak Kannada and Hindi only. Basing on this information answer the following questions.
How many persons in the group speak all the three languages
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