i) In the table of 3, 1 person has to sit down as a starting point, so that means the remaining 2 seats can be filled by 7x6 people. The table of 5 then has to have one person as a starting point as well, leaving the 4 seats with 4x3x2x1 options. That means a total of 7x6x4x3x2x1= 1008 options...