Question

N!+ (n+1)! / (n-1)! jak to rozwiązać.

Answer 1

n!+(n+1)!/(n-1)!=

={[1*2*3*..*.(n-1)*n]+[1*2*3*....(n-1)*n*(n+1]}/[1*2*3*...(n-1)=

n+n*(n+1)=n+n^2+n=n^2+2n