Question

sa se scrie un program care citeste nr natural n si determina suma s=1*2+2*3+3*4+...+n*(n+1)

Answer 1

var n,i,s:integer;
begin
Write('Numarul: ');
read(n);
for i:=1 to n do s+=i*(i+1);
writeln('Suma este: ',s);
end.