During the Test, students are asked to work on 7 Quest. out of 10 Question.Qno. 1 to 5 are compulsory. Many ways students choose number of questions to work on are ...A.10, B.11, C.12, D.13, E.14

Question

Please someone help me. I will appreciate it :)

Answer 1

Each student needs to do a total of 7 questions

1-5 are compulsory, then they can choose 2 out of the 5 questions left (6-10).

We need to calculate combinations of 2 in a set of 5 => (5 / 2) = 5!/(2!3!) = 5*4/2 = 10