D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST

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  1. Zhy's Avatar
    • Overlord in Training
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by mashmammad)
    arsey ,i know it might sound silly. but although i knew how to schedule i didnt have time for finding lst and these stuff. so i scheduled it by just moving the activities and i some how managed to do it with 3 workers. but it really didnt look like yours. do you think there is another way of scheduling that problem? do i get any marks there?
    Yeah, there's more than one solution.
  2. Arsey's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by raheem94)
    I have seen that the rule regarding multiple attempts is unclear to most of us. Can you please give us more detail about it and also it will be better if you can give the link to the place where it is written.

    :ta:
    if two complete solutions are given, with nothing crossed out, no indication of which the the' solution, then both will be marked and the one where the most marks available will be awarded.


    If a complete correct solution is written down and crossed out, it will still be marked.

    If a complete correct solution is written down and crossed out, but then replaced with anything it will not be marked and whatever is not crossed out, however, little (or wrong) will be marked.

    I have seen that written a few times on instructions to markers, I have even queried this policy with edexcel. Edexcel say that this is very rarely seen, when students don't know how to answer a question it is that they don't know any correct method rather than two or more possible methods.
  3. lulu61's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    Is this the edexel D1 paper?
  4. raheem94's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    if two complete solutions are given, with nothing crossed out, no indication of which the the' solution, then both will be marked and the one where the most marks available will be awarded.


    If a complete correct solution is written down and crossed out, it will still be marked.

    If a complete correct solution is written down and crossed out, but then replaced with anything it will not be marked and whatever is not crossed out, however, little (or wrong) will be marked.

    I have seen that written a few times on instructions to markers, I have even queried this policy with edexcel. Edexcel say that this is very rarely seen, when students don't know how to answer a question it is that they don't know any correct method rather than two or more possible methods.
    :ta: for clearing the confusion.
  5. Dreamweaver's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    x
    I asked my teacher about this but he rejected it on the basis that if you were allowed to give multiple answers to a question, what's stopping you from listing loads of random numbers and guessing the answer, by chance, correctly?

    I'm assuming he's wrong then?
  6. raheem94's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Dreamweaver)
    I asked my teacher about this but he rejected it on the basis that if you were allowed to give multiple answers to a question, what's stopping you from listing loads of random numbers and guessing the answer, by chance, correctly?

    I'm assuming he's wrong then?
    I think it varies a bit by the type of question.

    Example: If the question asks for the type of distribution we can't just write the names of all.

    But in questions with higher marks it is probably acceptable. Though there is a lot of confusion on this, i have also seen many people who aren't convinced that it is acceptable. Though i did it on my S1 paper. I didn't knew how to answer a probability question so i did multiple attempts for it and fortunately one of those answers matched with Arsey's.
  7. Dreamweaver's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by raheem94)
    x
    Ah that makes more sense. I plan to use this to my advantage for FP2 inequality questions if needed. You can solve them using two different methods but for some questions only one method will work even if you do the other one correctly you will still miss solutions.
  8. raheem94's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Dreamweaver)
    Ah that makes more sense. I plan to use this to my advantage for FP2 inequality questions if needed. You can solve them using two different methods but for some questions only one method will work even if you do the other one correctly you will still miss solutions.
    Tbh, inequalities is the easiest chapter of FP2.

    Are the past paper inequality questions more difficult than the book's?
  9. Dreamweaver's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by raheem94)
    Tbh, inequalities is the easiest chapter of FP2.

    Are the past paper inequality questions more difficult than the book's?
    Yeah they are easy but sometimes you have to be careful. I remember doing one in a paper following the method in the book but it didn't work. The question was weird so don't worry. Doubt it will come up. Normally it's easy.
  10. holahola's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    When HI is removed, the valency of H and ai becomes even.

    Now that you are allowed different start and end points the graph only needs to be semi eulerian; however, this means that the start and end node have to be the two nodes with the odd valency.

    Also for the maximum matching did you have to list the final matching or can you just draw it
  11. Arsey's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by holahola)
    Also for the maximum matching did you have to list the final matching or can you just draw it
    Drawing is fine
  12. Arsey's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Dreamweaver)
    I asked my teacher about this but he rejected it on the basis that if you were allowed to give multiple answers to a question, what's stopping you from listing loads of random numbers and guessing the answer, by chance, correctly?

    I'm assuming he's wrong then?
    Clearly listing hundreds of answers is not going to gain you any marks.

    What we are referring to is when you give more than one complete method leading to different solutions.

    I absolutely agree that it seems bonkers that marks are awarded in such cases, but that is the marking guidance.

    Edexcel say that they do not have any evidence to suggest that this is a tactic that students use to gain marks, if it were, this guideline would be 'reviewed'.

    Ask your teacher to contact edexcel and they will confirm this is marking policy.


    We discussed it at length in one thread last summer??? I posted the exact guidelines at the time directly taken from the mark schemes.
  13. Dreamweaver's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    Clearly listing hundreds of answers is not going to gain you any marks.

    What we are referring to is when you give more than one complete method leading to different solutions.

    I absolutely agree that it seems bonkers that marks are awarded in such cases, but that is the marking guidance.

    Edexcel say that they do not have any evidence to suggest that this is a tactic that students use to gain marks, if it were, this guideline would be 'reviewed'.

    Ask your teacher to contact edexcel and they will confirm this is marking policy.


    We discussed it at length in one thread last summer??? I posted the exact guidelines at the time directly taken from the mark schemes.
    Thanks for clearing that up. I remember reading something about this last year, not sure if it was me or someone else. I went to my teacher insisting that you were allowed to give multiple solutions but i think he interpreted it differently and hence rejected it on the basis of pure madness. It does seem rather odd to me but hey, i'm not complaining. I normally finish papers well before the allotted time so i'll just go over it and do it all again. I hope we actually get a challenging paper. There's nothing more that annoys me more than getting an easy paper, making a stupid mistake and dropping 15 UMS. Bye bye A*.
  14. tiny hobbit's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by raheem94)
    :ta: for clearing the confusion.
    Happy now? You clearly didn't believe me when I told you the same thing.

    The same thing applies to A level Maths papers set by CIE, the overseas wing of the Cambridge board:
    "If work is deleted and replaced, please mark the replacement only. If work is deleted without replacement, please mark the deleted work. If two solutions are offered, please allow marks for the better solution."

    Very polite isn't it?
    Last edited by tiny hobbit; 22-05-2012 at 20:01.
  15. raheem94's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by tiny hobbit)
    Happy now? You clearly didn't believe me when I told you the same thing.

    The same thing applies to A level Maths papers set by CIE, the overseas wing of the Cambridge board:
    "If work is deleted and replaced, please mark the replacement only. If work is deleted without replacement, please mark the deleted work. If two solutions are offered, please allow marks for the better solution."

    Very polite isn't it?
    I discussed this issue with you earlier as well, that's why i attempted multiple solutions in the S1 exam, so i did believe you.

    But the thing that confused me was that the day i again asked you about it, others didn't looked convinced by this argument. Some of the very experienced people here said that doing two solutions will get me zero marks for the question.

    You can have a look at this thread, to see why i got confused.

    Its not that i didn't believe you, i am sure that i have seen it written somewhere may be it was an Arsey's post, but no one other looked willing to believe it.
  16. raheem94's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    Clearly listing hundreds of answers is not going to gain you any marks.

    What we are referring to is when you give more than one complete method leading to different solutions.

    I absolutely agree that it seems bonkers that marks are awarded in such cases, but that is the marking guidance.

    Edexcel say that they do not have any evidence to suggest that this is a tactic that students use to gain marks, if it were, this guideline would be 'reviewed'.

    Ask your teacher to contact edexcel and they will confirm this is marking policy.


    We discussed it at length in one thread last summer??? I posted the exact guidelines at the time directly taken from the mark schemes.
    I do remember that you posted a list of guidelines, and in the end of that post it was also written to notice the point about multiple solutions.

    Do you know in which thread you posted it?
    I will like to read all of them again, i have tried to find it out but failed.
  17. holahola's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    (Original post by Arsey)
    Drawing is fine
    thankyou
  18. imsosuperman's Avatar
    • Full Member
    • Posts: 129
    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    I put the optimal solutions as (47,10), was it 48?
    I thought it was quite hard for a d1 paper tbh, c3 and c4 hopefully be kind!!
  19. holahola's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    How many marks would i get for say for the definition: the number of arcs coming from the node
  20. -Lychee's Avatar
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    Re: D1 May 2012 - Post Exam Thread - Paper and Solution in the FIRST POST
    *wave*

    For third question, i actually didnt read the question carefully, only drew one arc for D, which is the shortest arc (DB), hence that...i then only used DB in part b too for kruskal's algorithm... how many marks will i lose in total for question 3?...

    =.= so stupid of me...
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