In an experiment on social interaction 3 people will sit in 3 seats in a row, in how many ways can this be done?

Call the 3 people A B and C and see how many possibilitys you get

A B C
A C B
B A C
B C A
C A B
C B A

What i do is slowly swap them so if you had 4 youde keep the first 2 the same

A B C D
A B D C

Then swap the second one
A C B D
A C D B

then swap again

A D B C
A D C B
and once they are all done, swap the first one and repeat (swap a to b, then swap the last 2 etc)

square root of three or 1.73205

Hope this helps :)