suma n*(n+1)

//1*2+2*3+..+n*(n+1)#include<iostream.h>#include<conio.h> int p(int k){return k*(k+1);} int s(int k){if (k==0) return 0;else return p(k)+s(k-1);} void main(){int n;cout<<“n=”;cin>>n;cout<<s(n)<<endl;getch();} {module orizontal600}