In a class of 35 students, 13 students in 'Urdu', 20 students in 'Science', 17 students in 'Hindi', 9 students in 'Urdu' and 'Science', 8 students in 'Science' and 'Hindi', 5 students in 'Hindi' and 'Urdu', 3 students in all the three subjects could get first class marks. How many of them got first class marks in only 'Urdu'? |