If you keep them in a line, there are 24 ways to line them up. Then of course
there are squares, diamonds, rectangles, parallelograms, stacks, etc.
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5
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
24
There are 24 ways to arrange 4 people in a row.
15C3 = 455