@keith williams: Thanks for the reply, I do understand the difference. The problem is what do EASA expect because people passing the exams in different nations in Europe come with different information.
In the question banks its the same sometimes it is LDR but correct answer is LD and sometimes the other way around.... some students claimed and Aviation Exam got it as a note that in Poland we should never factorize for B class SEP unless it is clearly written that it is a commercial flight and only then LDR shall be used.
Is it even possible that EASA give different answers for the same question in different nations, can the CAA make their own questions or are the questions made by EASA and there can only be one correct answer to a question with the same data provided ? Seriously it can fail the whole exam or at least the score depending on how many questions of this kind are drawn. So I do not know who to trust the answer in the questionbank or the feedback in Aviation Exam ? There should be one simple explanation like for example LDR means LDR or only factorize if its a commercial flight and disregard everything else.
Or else this is not an exam to check what the students do know but to check who is lucky (or who memorized all numbers in question bank in case the answers there are universal (they go both ways for the same wording).