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Combinari de 5 luate cate 5 ?????

Răspuns :

Salut,

Știm formula (o știai ?):

[tex]C_n^k=\dfrac{n!}{k!\cdot (n-k)!}.\\\\C_5^5=\dfrac{5!}{5!\cdot (5-5)!}=\dfrac{5!}{5!\cdot 0!}=1,\ am\ folosit\ c\breve{a}\ 0!=1.[/tex]

Green eyes.