Question

resolva as questões (n+ 2)!-(n+1)! - n(n - 1 ) ! = 25

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Answer 1

Resposta:

n^2 + n - 2n + 2 - n^2 + n = 25

- n +2 = 25

- n = 25 - 2

- n = 23 x ( - 1)

n = - 23