With 2 people, you have two ways: 1,2 and 2,1

With 3 people, you have six ways. 1,2,3; 1,3,2; 2,1,3; 2,3,1; 3,1,2; 3,2,1

With 4 people, you have 24 different ways. (Not gonna list them all here.)

The formula is "people"!. (People factorial)

So with 8 people you have 8! or 8x7x6x5x4x3x2x1 different ways.

Go to Google and type in 8! to see how many that is.