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In a class of 31 students, 7 students in 'Sanskrit', 9 students in 'German', 21 students in 'Spanish', 1 students in 'Sanskrit' and 'German', 4 students in 'German' and 'Spanish', 4 students in 'Spanish' and 'Sanskrit', none of the students in all the three subjects could get first class marks. How many of them got first class marks in only 'Sanskrit'? |