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    (Original post by TeeEm)
    which day?
    23 days until results day, the double product question
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    (Original post by Gome44)
    23 days until results day, the double product question
    I deliberately did not put a solution because I though physicsmaths was going to "kill it". He has disappeared since ...

    (I get all these individuals which of course can do all these questions after they see the solution.)

    I will put the solution up together with today's questions.
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    (Original post by TeeEm)
    I deliberately did not put a solution because I though physicsmaths was going to "kill it". He has disappeared since ...

    (I get all these individuals which of course can do all these questions after they see the solution.)

    I will put the solution up together with today's questions.
    I havent tried it yet lol. Looks hard. Prob wont try it yet tbh. Cant be bothered


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    (Original post by physicsmaths)
    I havent tried it yet lol. Looks hard. Prob wont try it yet tbh. Cant be bothered


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    it looks hard and it is hard.
    I was hoping you will do it so it saves me write a solution.

    This question is part of a Legendre question which I was doing a few days back and I thought I could change and adapt some bits to make this disgustingly beautiful question.

    I will put the solution up tonight.
    (I have to write it)
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    (Original post by TeeEm)
    it looks hard and it is hard.
    I was hoping you will do it so it saves me write a solution.

    This question is part of a Legendre question which I was doing a few days back and I thought I could change and adapt some bits to make this disgustingly beautiful question.

    I will put the solution up tonight.
    (I have to write it)
    Is the question wrong? Or am I just misinterpreting it?
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    (Original post by Gome44)
    Is the question wrong? Or am I just misinterpreting it?
    I think there is a typo (goddam!!)
    I have a feeling that at the denominator of the double product it should be (2r) instead of (2m)
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    (Original post by Gome44)
    Is the question wrong? Or am I just misinterpreting it?
    (Original post by TeeEm)
    I think there is a typo (goddam!!)
    I have a feeling that at the denominator of the double product it should be (2r) instead of (2m)
    I have to sort it later

    Take it from this line

    it is correct from here to the answer at the end
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  1. File Type: pdf Presentation1.pdf (54.3 KB, 49 views)
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    (Original post by TeeEm)
    I have to sort it later

    Take it from this line

    it is correct from here to the answer at the end
    Got an unwanted k! :L

    Know where I've gone wrong?
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    (Original post by Gome44)
    Got an unwanted k! :L

    Know where I've gone wrong?
    yes!! you are very good

    I take it you started from my new bit until I sort the product out.

    when I was doing the question I did exactly the same mistake!

    it took hours to find it ...

    it is something which is so easy to miss

    what I can tell you that is that if the k! was n! everything should work
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    (Original post by TeeEm)
    yes!! you are very good

    I take it you started from my new bit until I sort the product out.

    when I was doing the question I did exactly the same mistake!

    it took hours to find it ...

    it is something which is so easy to miss

    what I can tell you that is that if the k! was n! everything should work


    Ive had enough of factorials for one day, so I'll have a look again tomorrow
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    (Original post by Gome44)


    Ive had enough of factorials for one day, so I'll have a look again tomorrow
    No worries

    the answer will be up tonight.

    I sorted the Product out. Unfortunately it can only be written as a triple (I think)
    I am changing the original file now
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    (Original post by TeeEm)
    No worries

    the answer will be up tonight.

    I sorted the Product out. Unfortunately it can only be written as a triple (I think)
    I am changing the original file now
    Ok, so I just looked at the answer (I know I said I'd had enough of factorials for a day but it kept bugging me), and it seems on your penultimate line you still have a k!, but get rid of it on your last line?

    Also, bit confused on this double/triple product notation. I thought it would mean the first line on the attached image, but in your solution you use it like the second line?
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    (Original post by Gome44)
    Ok, so I just looked at the answer (I know I said I'd had enough of factorials for a day but it kept bugging me), and it seems on your penultimate line you still have a k!, but get rid of it on your last line?

    Also, bit confused on this double/triple product notation. I thought it would mean the first line on the attached image, but in your solution you use it like the second line?

    I think I had enough of factorials now.

    yes you are correct... typo upon typo

    There should be a K! in the question and in my solution, obviously!!

    here I go again try to correct me .... This question set me one hour behind with my own work today. Physicsmaths must be laughing ...
    I will correct it again.
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    (Original post by TeeEm)
    I think I had enough of factorials now.

    yes you are correct... typo upon typo

    There should be a K! in the question and in my solution, obviously!!

    here I go again try to correct me .... This question set me one hour behind with my own work today. Physicsmaths must be laughing ...
    I will correct it again.
    I think i need to do it now haha.


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    (Original post by Gome44)
    Ok, so I just looked at the answer (I know I said I'd had enough of factorials for a day but it kept bugging me), and it seems on your penultimate line you still have a k!, but get rid of it on your last line?

    Also, bit confused on this double/triple product notation. I thought it would mean the first line on the attached image, but in your solution you use it like the second line?
    the double product operator I have not used it before.

    On inspection it does not work quite like the series operator.

    In the question which I made I did not start with any product operator but with the expanded products that I have in the third line.

    I tried to put it into products which clearly are wrong as the rules of nesting which govern series do not quite work the same way.

    So when I rewrite the question I will start with a product of 3 separate product operators, as this is the question, and the object of my question.

    I will do some research on nested product very soon.

    thanks for the proof reading!
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    21 days to A level results

    Question for Thursday 23/07/15
    AS Level Maths Upwards but unusual context


    and for those who want that little bit extra,
    A level Maths level Upwards required
    Attached Images
  2. File Type: pdf Q24, Thursday 23-07-15.pdf (16.3 KB, 89 views)
  3. File Type: pdf Q24, Thursday 23-07-15, EXTRA.pdf (19.5 KB, 75 views)
  4. File Type: pdf Q24, Thursday 23-07-15, solution.pdf (188.9 KB, 68 views)
  5. File Type: pdf Q24, Thursday 23-07-15, EXTRA, solution.pdf (187.1 KB, 70 views)
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    (Original post by TeeEm)
    21 days to A level results

    Question for Thursday 23/07/15
    AS Level Maths Upwards but unusual context


    and for those who want that little bit extra,
    A level Maths level Upwards required
    Me upon seeing a factorial in the answer:
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    (Original post by Gome44)
    Me upon seeing a factorial in the answer:
    I do not blame you

    I checked them today the best I could, but when you mass produce like I do, typos/mistakes are inevitable ...
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    (Original post by TeeEm)
    21 days to A level results

    Question for Thursday 23/07/15
    AS Level Maths Upwards but unusual context


    and for those who want that little bit extra,
    A level Maths level Upwards required
    Are all these infinite product Qs just a case of spotting a way of writing the product such that you can cancel down and be left with a nice little expression involving N? And then of course consider what happens when N tends to infinity. I couldn't spot that little trick in Q23 yesterday where you split the product into 2 separate products so that you could cancel down. I hope that makes sense.
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    (Original post by Gilo98)
    Are all these infinite product Qs just a case of spotting a way of writing the product such that you can cancel down and be left with a nice little expression involving N? And then of course consider what happens when N tends to infinity. I couldn't spot that little trick in Q23 yesterday where you split the product into 2 separate products so that you could cancel down. I hope that makes sense.
    they all work the same
    I made 4 questions yesterday, some are harder.

    expand
    look for patterns to cancel
    get a compact simplified answer
    let it run to infinity
 
 
 
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