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Conider the following data of mathematic tudent. 60 tudy French, 30 tudy French and German
55 tudy German, 25 tudy French and Ruian
75 tudy Ruian, 35 tudy German and Ruian
12 tudent tudy all the three language. Let F, G, R denote the et of tudent tudying French, German and Ruian repectively. Then find the number of tudent tudying at leat one of the three language i. E, n(FUGUR)