En resumen

Utilizaremos lo siguiente<img src="https://tex.z-dn.net/?f=n%21%3Dn%28n-1%29%21" /><img src="https://tex.z-dn.net/?

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Tunnal
8

Utilizaremos lo siguiente<img src="https://tex.z-dn.net/?f=n%21%3Dn%28n-1%29%21" /><img src="https://tex.z-dn.net/?f=%5Cdfrac%7B%28a%2B4%29%21%7D%7B%28a%2B3%29%21%7D%3D10%5C%5C%5C%5C%5C%5C%5Cdfrac%7B%28a%2B4%29%28a%2B3%29%21%7D%7B%28a%2B3%29%21%7D%3D10%5C%5C%5C%5C%5C%5Ca%2B4%3D10%5C%5C%5C%5C%5Cboxed%7Ba%3D6%7D" />.