NUMBER of student : 60Number of STUDENTS who TOOK none of the subjects : 8Remaining students in the CLASS (at LEAST one subject) = 52Number of students who took Mathematics : 29Number of students who took Biology : 32Total number who took Mathematics or Biology or both = 32 + 29 = 61Total number who took both the subjects = Total number who took at least one of Mathematics or Biology or both – remaining students in the class = 61 – 52 = 9.Hence, 9 is the correct answer.