(a) Five distinct integers are to be chosen from the set { 1, 2, 3, 4, 5, 6, 7, 8} and placed in some order in the top row of boxes in the diagram. Each box that is not in the top row then contains the product of the integers in the two boxes connected to it in the row directly above. Determine the number of ways in which the integers can be chosen and placed in the top row so that the integer in the bottom box is 9 953 280 000