(x - 2)! = 1*2*..*(x-4)*(x - 3)*(x - 2)
(x - 1)!*x*(x+1) = 1*2*...*(x - 2)(x - 1)*x * ( x + 1) = (x + 1)!
(x - 2)! ≠ x!(x-2)(x-1)
(x - 2)! ≠ (x-1)!(x-2)
(x - 2)! = (x - 3)! * (x - 2) = (x - 4)! *(x - 3)*(x - 2) итд
(x - a)! = (x - a - 1)!*(x - a)
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(x - 2)! = 1*2*..*(x-4)*(x - 3)*(x - 2)
(x - 1)!*x*(x+1) = 1*2*...*(x - 2)(x - 1)*x * ( x + 1) = (x + 1)!
(x - 2)! ≠ x!(x-2)(x-1)
(x - 2)! ≠ (x-1)!(x-2)
(x - 2)! = (x - 3)! * (x - 2) = (x - 4)! *(x - 3)*(x - 2) итд
(x - a)! = (x - a - 1)!*(x - a)