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Ajutorrr, repede va rog​

Ajutorrr Repede Va Rog class=

Răspuns :

 

[tex]\displaystyle\bf\\Explicatii:\\\\C_n^k=\frac{A_n^k}{P_n}\\\\\implies~~\frac{A_9^3}{P_3}=C_9^3\\\\Rezolvare:\\\\ C_9^3=\frac{A_9^3}{P_3}=\frac{9\times8\times7}{1\times2\times3}=3\times4\times7=12\times7=\boxed{\bf84}[/tex]