(7) A party will have hexagonal tables placed together with space for one person on each open side (see diagram). 1 2 3 n (a) Draw 4 separate diagrams, to represent the setup for 1 table, 2 tables, 3 tables and 4 tables. Write down how many people can be seated for each setup. (b) If n is the number of tables, and a, is the number of available seats with n tables, is this sequence arithmetic or geometric? What would be the equation for it