The main focus of this permutation & combination question is part (iii) where students are expected to follow a simple definition and solve the question. I have used the listing method which could be slightly longer but it is clearer for understanding for most students. This is the thinking process but there is certainly a shorter presentation to the listing method by considering general cases since this is a 5 marks question. I would love to hear from you on the shorter presentation, leave your working in the comments section.
