Bài 1:
Program NhatNgu;
Uses crt;
Var n,i,s: longint;
Begin
Clrscr;
Write('Nhap n: '); Readln(n);
s:=0;
For i:=1 to n do
s:=s+i;
Write('S = ',s);
Readln
End.
Bài 2:
Program NhatNgu;
Uses crt;
Var n,i,s: longint;
Begin
Clrscr;
Write('Nhap n: '); Readln(n);
s:=1;
For i:=1 to n do
s:=s*i;
Write('S = ',s);
Readln
End.