4*3*2*1 = 24 ways.
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
I make it 136 ways.
If the people are always facing forward? 24 ways.
Assuming you mean the order in which they stand in a line, this is simple combination of three from three, and there are six possible combinations:ABCACBBACBCACABCBA
There are 19 ways to do this.
128
There are 5040 ways.
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
5040
36
5! (5 factorial), which is 1 x 2 x 3 x 4 x 5.
7
I make it 136 ways.
20*19*18*17*16 = 1860480 ways.
If the people are always facing forward? 24 ways.
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".
This is a question of permutation. There are only 3 ways. A-B-C, B-C-A, C-A-B