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- program feladat11;
- uses crt;
- var i,n,sum:integer;
- begin
- clrscr;
- writeln('Adj meg egy számot.');
- readln(n);
- sum:=0;
- for i:=1 to n do begin
- sum=sum+i*2;
- end;
- writeln(sum);
- readkey;
- end.
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