People in a Line People stand in a line at movies, the grocery store, and many other places.
a) In how many ways can two people stand in a line?
b) In how many ways can three people stand in a line?
c) In how many ways can four people stand in a line?
d) In how many ways can five people stand in a line?
e) Using the results from parts (a) through (d), make a conjecture about the number of ways in which npeople can stand in a line.
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