Arrangement and combination: a photographer should take eight people and six photos of a bridge. There are several ways to build the right bridge between all people.

Make sure everyone is standing in the middle of the bridge, which should be a complete line of six people. 6! =6*5*4*3*2* 1=720; The last six people can stand in the middle row of the bridge, and two people can stand in two rows, so that two people can stand in the middle at a time. Besides, who would be so bored as to try to get each of you to stand in the middle once in so many ways? Generally speaking, "C6 is 1".