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Clasa a X-a - Algebra - Aranjamente.Combinari. Binomul lui Newton

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$Sa\;se\;calculeze\;\frac{A_{n}^{6}+A_{n}^{5}}{A_{n}^{4}}.$

1) $\left ( n-4 \right )!$

2) $\left ( n-4 \right )^{2}$

3) $n\left ( n-4 \right )$

Alege varianta corecta:

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