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In a class of 30 students, 16 students in 'English', 15 students in 'Mathematics', 10 students in 'German', 6 students in 'English' and 'Mathematics', 5 students in 'Mathematics' and 'German', 8 students in 'German' and 'English', 4 students in all the three subjects could get first class marks. How many of them got first class marks in only 'English'? |