. Students of grade XI are given the option of choosing any subject they want to study. In a school, out of 120 students, 15 opted Mathematics only, 16 opted Biology only, 9 opted for C++ only and 45 opted for C++ and Mathematics, 30 opted for C++ and Biology, 8 opted for Mathematics and Biology, and 80 opted for C++. Draw a Venn diagram representing the above given information by letting ?x? to be the number of students who opted for all the three subjects? (1) (b) Find the number of students who opted for mathematics? (1) (c) Find the number of students who opted for any of the three subjects?