5. If only taking part of the course (Math or Statistics alone), then answer only the section. 6. Make and state any assumptions for problems as is appropriate Section 1: Mathematics 1. Show that the matrix B is idempotent, given that B = Inxn Ann (2 points) 2. Find the determinant and inverses of the following matrices: (8 points) i)A=)B= 3 3.DAB ( as in i and ii) 1 2 31 12 C = 6 5