24 ways
5040
There are n! (n factorial) ways that n people can stand in line. So six people can stand in line in: 1*2*3*4*5*6 = 720 different ways
720
If the people are always facing forward? 24 ways.
36
6! = 720
20160
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
27!
8x4=32
Not sure what a strait line is! Five people can stand in a straight line, with Jessie third in 24 ways if you ignore left-to-right and right-to-left "reflections".