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Ma ajuta cineva cu urmatoarea problema.


Aranjament de n de cate 7=(n-4)(n-3)(n-2)(n-1)n


Răspuns :

n!/(n-7)!=(n-4)(n-3)(n-2)(n-1)n, (n-7)!(n-6)(n-5)(n-4)(n-3)(n-2)(n-1)n/(n-7)!=(n-4)(n-3)(n-2)(n-1)n, (n-6)(n-5)=0, n1=6, n2=5