7. Determine the number of students in cultural activity

In a class, all the students take part in either music or photography or both. In which 26 students take part in music, 33 students take part in photography, and 2 students take part in both music and photography.

 

(i) The number of students who take part in only music is students.
(ii) The number of students who take part in the only photography is students.
(iii) The total number of students in the class is students.