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Combinari de n luate cate 3=6n

Răspuns :

Aplica formula pentru Combinari :
Cn luate cate 3=n!/3!(n-1)!
n!=1^2^3^...^(n-1)^n
=>C n luate cate 3 =1^2^3^...^(n-1)^n/(1^2^3)^(1^2^3^...^(n-1))
Facandu-se simplificarile de rigoare =>C n luate cate 3 =n/6