40320... 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
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120
If the people are always facing forward? 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
100 boys
5x4x3x2x1=120