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The Edexcel C2 (24/05/12 - AM) Revision Thread

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    (Original post by wam-bam)
    it's here

    http://www.edexcel.com/migrationdocu...cal-Tables.pdf

    on page 5

    also here is a briliant C2 in a page thing which gives you all the formulas we need and there's smiley faces next to the ones that are given to us in the formula booklet!

    http://www.morehouse.org.uk/MH_Pupil...2inEssence.pdf

    hope that helps!
    Great! Thanks so much!
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    What are the proofs for geometric series?
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    (Original post by 101101)
    What are the proofs for geometric series?
    you need to prove the formula for the sum of a series
    look it up in your text book or
    http://www.examsolutions.co.uk/maths...tutorial-1.php
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    (Original post by 101101)
    What are the proofs for geometric series?
    

{S}_{n}=a + ar + a{ r }^{ 2 } + ... + a{ r }^{ n-1 }

r{S}_{n}=ar + a{ r }^{ 2 } + a{ r }^{ 3 } + ... + a{ r }^{ n }

    Subtracting:

    

{S}_{n} - r{ S }_{ n }=a - a{ r }^{ n }

{S}_{n}(1 - r)=a(1 - { r }^{ n })

{S}_{n} = \frac {a(1 - { r }^{ n })}{1 - r}
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    Here's my notes if anyone wants them :P
    Attached Files
  1. File Type: pdf Core 2.pdf (658.0 KB, 265 views)
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    (Original post by Brad0440)
    Here's my notes if anyone wants them :P
    Thanks! These are great!
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    What are the reasons for your estimations of the area under a curve being over/under using the trapezium rule?

    June 09 4c I've got the answer as 6.133 which is correct but then it asks whether this is an over or under estimate and asks for a reason why. Never seen this question before and it's 2 marks so if anyone could help, much appreciated.
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    Do we need to know transformations for this C2 exam??
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    (Original post by Scorcher)
    What are the reasons for your estimations of the area under a curve being over/under using the trapezium rule?

    June 09 4c I've got the answer as 6.133 which is correct but then it asks whether this is an over or under estimate and asks for a reason why. Never seen this question before and it's 2 marks so if anyone could help, much appreciated.
    Can be either;
    Click image for larger version. 

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    If they ask the graph will probably be fairly easy to draw, or it might even be provided already.
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    (Original post by Scorcher)
    What are the reasons for your estimations of the area under a curve being over/under using the trapezium rule?

    June 09 4c I've got the answer as 6.133 which is correct but then it asks whether this is an over or under estimate and asks for a reason why. Never seen this question before and it's 2 marks so if anyone could help, much appreciated.
    ||
    Attached Files
  2. File Type: pdf Explanation of over and underestimates.pdf (103.5 KB, 125 views)
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    (Original post by Scorcher)
    What are the reasons for your estimations of the area under a curve being over/under using the trapezium rule?

    June 09 4c I've got the answer as 6.133 which is correct but then it asks whether this is an over or under estimate and asks for a reason why. Never seen this question before and it's 2 marks so if anyone could help, much appreciated.
    Think those above me have got you covered ;P But heres just a quick doodle of how it looks from question.
    Attached Thumbnails
    Click image for larger version. 

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    (Original post by Wooden)
    Do we need to know transformations for this C2 exam??
    Yeah. The 2012 January C2 one had a transformation question.
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    (Original post by BaconFTW)
    Can be either;
    Click image for larger version. 

Name:	Composite_trapezoidal_rule_illustration.png 
Views:	58 
Size:	109.0 KB 
ID:	150373

    If they ask the graph will probably be fairly easy to draw, or it might even be provided already.

    (Original post by Brad0440)
    ||

    (Original post by gadzoinks)
    Think those above me have got you covered ;P But heres just a quick doodle of how it looks from question.
    Thanks people! I understand it now
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    I am expecting a big GP question probably involving logs to solve. Also, get all over the proof as it hasn't been asked for a long time.

    I am also expecting a difficult circles question.
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    It is worth reading through the last few C2 exam threads, see what the common errors were

    Jan 2012

    http://www.thestudentroom.co.uk/show....php?t=1892666


    Revision thread

    Contains past papers, boundaries, model answers etc

    http://www.thestudentroom.co.uk/show....php?t=1619114
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    (Original post by Arsey)
    I am expecting a big GP question probably involving logs to solve. Also, get all over the proof as it hasn't been asked for a long time.

    I am also expecting a difficult circles question.
    Can I ask a few questions?

    (1) By big GP question do you mean something similar to the one found in June 2007 (http://www.thomas-reddington.com/upl..._june_2007.pdf) [question 8]?
    Though this isn't a difficult example, is this what you mean? A wordy question finishing with some log rearrangement?

    (2) Which proofs do we need to know asides Sum of a geometric series for C2?

    (3) Can I ask what kind of thing you'd expect to make a circles question difficult. Would it just require a knowledge of all the circle theorems?

    Many thanks indeed!
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    (Original post by dslc)
    Can I ask a few questions?

    (1) By big GP question do you mean something similar to the one found in June 2007 (http://www.thomas-reddington.com/upl..._june_2007.pdf) [question 8]?
    Though this isn't a difficult example, is this what you mean? A wordy question finishing with some log rearrangement?

    (2) Which proofs do we need to know asides Sum of a geometric series for C2?

    (3) Can I ask what kind of thing you'd expect to make a circles question difficult. Would it just require a knowledge of all the circle theorems?

    Many thanks indeed!
    Yeah prob

    Just that one

    Just one that requires a bit of thought, knowledge of circle thms and trig
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    (Original post by Arsey)
    Yeah prob

    Just that one

    Just one that requires a bit of thought, knowledge of circle thms and trig
    Thanks a lot
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    why it gotta be hard @@ after setting a retarded s1 paper
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    (Original post by dslc)
    (2) Which proofs do we need to know asides Sum of a geometric series for C2?
    That is the only proof you need to know
Updated: May 26, 2012
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