One row of eighteen people, eighteen rows of one person, nine rows of two people or two rows of nine people.
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3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
I'm pretty sure you can just do 8! which is 40320 different ways.
24 ways
In a line, in 6 ways. Around a table, in 2 ways.