Im just writing stuff because questions have to be atleast 20 characters long so I'm just trying to fill up some space.
1 answer:
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Combinations = n! / (n - r)! r!
In this case:
n = 4
r = 3
Combinations = 4! /(4-3)! 3! = 24/(1)(6) = 24/6 = 4
Answer:
4 arrangements