Sa se rezolve ecuatiile
a)
[tex] \frac{(n + 2)!}{n! } = 72[/tex]
b)
[tex] \frac{n!}{(n - 4)!} = \frac{12n!}{(n - 2)!} [/tex]
c)
[tex] \frac{1}{n!} - \frac{1}{(n + 1)!} = \frac{ {n}^{3} }{n + 2) !}[/tex]
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