(n-2)! 2! = In-8)! 8! (n-2) (n-3) (n- 4)ln-5) (n.6) In-1)ln-e)! (n-P)! 8X7X6 x5 X4X3 (n2)In.3) In-4)n-5| In-61(n-1) : 8×7 x6 XJX4X3 = (10-a)l10-3) l10-4) li0-개10-6lo-기 3D h= l0

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