1) Calculati suma: S=1+1x2+1x2x3+..........+1x2x3x.....xn Unde n apartine N(nr naturale), valoarea lui introducandu-se de la tastatura.
IN PASCAL !!! Dau coroana !!


Răspuns :

program suma;
var  n, i, s: integer;
begin  read(n);  s := 1;  for i := 1 to n do s := s + i * (i - 1);  write(s);end.