Please solve for me

2. Express in either factorial notation or as a quotient of factorials, i.e. dividing factorial by another. (1 mark each) a) 11 x 10 x 9 x ..! x 3 x 2 x 1 6) 7 x 6 x 5 x4 [2] C) 6PA d) n(n-1)(n -2) [2] 3. Express in the form ,P.. 18! a) 5! b) 45 x 44 x 43 x 42 C) 12! [3]