There are 6 ways of selecting the 1st person, 5 ways of choosing the 2nd person, 4 ways of picking the 4th person......and so on.
The number of ways is 6 x 5 x 4 x 3 x 2 x 1 = 720.
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6 ways
Five numbers can be arranged in 5! = 120 ways.
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