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In a class of 34 students, 23 students in 'Mathematics', 29 students in 'Spanish', 18 students in 'Hindi', 19 students in 'Mathematics' and 'Spanish', 15 students in 'Spanish' and 'Hindi', 15 students in 'Hindi' and 'Mathematics', 12 students in all the three subjects could get first class marks. How many of them got first class marks in only 'Mathematics'? |