Respuesta :

ktreyb
First option is your answer. 

(2 - 1)! = 1! = 1

(3 - 1)! = 2! = 2 * 1 = 2

(4 - 1)! = 3! = 3 * 2 * 1 = 6

This was all I needed to confirm the choice. 

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