4*3*2*1 = 24 ways.
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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.
There are 19 ways to do this.
120 ways.120 ways.120 ways.120 ways.