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OCR (Not MEI) Core 2 Discussion Thread 17th May 2013 + Jan 13 Paper and MS Watch

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    (Original post by purplemind)
    Ok, so you first are given that there is a GP. Therefore terms of GP:
    u1=a
    u2=ar
    u3=ar^2
    u4=ar^3
    etc...
    You are given that 1st, 2nd and 4th term of GP form AP, so terms of AP:
    u1=a
    u2=ar
    u3=ar^3
    You know that u2-u1=u3-u2
    You get:
    ar-a=ar^3-ar
    a(r-1)=a(r^3-r)
    a is not equal to 0 so you can divide by a to get:
    r-1=r^3-r
    r^3-2r+1=0
    Hi i don't know if i'm being really stupid, but how do you know that
    u2-u1=u3-u2....?

    apologies if i am being really stupid haha
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    exam q. help xD

    tan a= 2/5
    what is cos a?

    i attempted it:

    a= tan^-1(2/5)
    a= 21.8

    cos(21.8)= 0.928

    mark scheme says: cos a= 5/√29


    can anyone help please?? thnx

    its ok i just realised i had the correct answer all along!!!! silly moi
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    (Original post by nimsay1)
    Hi i don't know if i'm being really stupid, but how do you know that
    u2-u1=u3-u2....?

    apologies if i am being really stupid haha
    It is an arithmetic progression. The common difference is the same between 3rd and 2nd term, and 2nd and 1 st term?
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    good luck everyone! we WILL pass!
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    (Original post by pinpin95)
    exam q. help xD

    tan a= 2/5
    what is cos a?

    i attempted it:

    a= tan^-1(2/5)
    a= 21.8

    cos(21.8)= 0.928

    mark scheme says: cos a= 5/√29


    can anyone help please?? thnx

    its ok i just realised i had the correct answer all along!!!! silly moi
    Answers on page 1 to this,
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    got a good feeling about this exam.. as long as it's not like the jan 2013 paper we should all be fine! good luck everyone
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    Mr M, please need you now!! Answers!!
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    That went pretty badly for me.

    Anyone get these:

    Area under graph: 2.4
    Solutions for cubic: pi, 4/3 pi and 2/3 pi
    34cm for perimeter of the shape
    62.2cm^2 for area of shape
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    Hi guys how did it go?
    there were two 5 markers that i couldnt get my head around and a 3 marker that was difficult
    but apart from that it was ok (13 marks + are hanging ) hope grade boundaries will be low
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    (Original post by Rrobba)
    That went pretty badly for me.

    Anyone get these:

    Area under graph: 2.4
    Solutions for cubic: pi, 4/3 pi and 2/3 pi
    34cm for perimeter of the shape
    62.2cm^2 for area of shape

    Cant remember the area under curve answer, I got same cubic answers and perimeter. I think my area was the same can't fully remember.
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    I think it was relatively easier than January exam. Fine for me.

    (Original post by Rrobba)
    That went pretty badly for me.

    Anyone get these:

    Area under graph: 2.4
    Solutions for cubic: pi, 4/3 pi and 2/3 pi
    34cm for perimeter of the shape
    62.2cm^2 for area of shape
    I got 37/30 for area under the curve.
    Got the same for cubic, perimeter and area.
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    (Original post by Rrobba)
    That went pretty badly for me.

    Anyone get these:

    Area under graph: 2.4
    Solutions for cubic: pi, 4/3 pi and 2/3 pi
    34cm for perimeter of the shape
    62.2cm^2 for area of shape
    Considering that i couldnt even do the are under the graph one - i think you've done well !
    I think i got similar answers to the last 3 , you'll be fine !
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    I got ~1.23 for area under graph, same solutions for cubic in cos and perimeter.. don't remember are of shape.
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    (Original post by mia_hilton)
    Considering that i couldnt even do the are under the graph one - i think you've done well !
    I think i got similar answers to the last 3 , you'll be fine !
    You had to subtract the area of the triangle.
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    When do you guys think mr m will load the answers up??
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    (Original post by purplemind)
    I think it was relatively easier than January exam. Fine for me.


    I got 37/30 for area under the curve.
    Got the same for cubic, perimeter and area.
    Well done, best not ask you what you think the grade boundaries will be then
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    (Original post by Music99)
    You had to subtract the area of the triangle.
    but how did you know the coordinate of the tangent when it hit the x axis?
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    (Original post by mia_hilton)
    Well done, best not ask you what you think the grade boundaries will be then
    Don't worry. I know many people in my school didn't like the exam either. I just had a lot of practice so I didn't find any questions a surprise.
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    what did everyone get for 'c' in the binomial question? i got 24, not sure if it's correct
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    (Original post by sbath94)
    what did everyone get for 'c' in the binomial question? i got 24, not sure if it's correct
    I got -11.
 
 
 
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