Răspuns:
29
Explicație pas cu pas:
6!/4!·2!+5!/3!-3!=6·5·4!/4!2!+5·4·3!/3!-3!=6·5/2+5·4-1·2·3=15+20-6=29
Cn luate k=n!/k!(n-k)!
An luate cate k=n!/(n-k)!
Pn=n!
