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OCR C2 Exam May 18th 2012

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    (Original post by JimJam1)
    for question 7aii) if you put [(2√10)+pi]/7 would you get any marks or did it have to be negative? or would this even remove it from its exact form?
    was this the trig one? I got -2root10 / 7 don't know where the pi came from
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    for questio 7 if you got the right answer but didnt use the method which will probably be on the markscheme ( the traingle one) would you still get the marks? i ended up using sin^2 +cos ^2 =1 and then devided by cos^2 and did a whole bunch of other stuff but i seem to have the same answer as everyone else so will i still get the marks?
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    (Original post by megank)
    Can anyone explain to me that last question?? :/ i messed it up and got a really heavy fraction
    Sure, if you can remind me of the question
    All I remember was that the answer was 2/3 but your probably know that by now.
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    I did so rubbish it's beyond me. Definitely going to be resitting THAT.
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    (Original post by J DOT A)
    A=45 not 45pie.

    If you substitute 0.5*(15/pi)^2*2/7pi or whatever the radian thing was it was 45
    someone I got 14.75 for the radius. Would that be accepted?
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    The periodic question was easy but I only wrote 'periodic' - would I get the mark?
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    (Original post by samjj8)
    It wasn't a nice paper. It was an OK paper.

    Question 7 part 2 wasn't nice.
    Question 9 wasn't nice.

    9 wasn't impossible, but it was a head scratching question.
    I know, I definitely bagged about 2 method marks for question 9bii. I just
    didn't revise enough to understand that the log sect. became 1.
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    anyone know if you can resit induvidual papers? or would I have to resit all of AS-level maths...
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    (Original post by cleverslacker)
    anyone know if you can resit induvidual papers? or would I have to resit all of AS-level maths...
    yes, you can resit ind papers C1 or C2
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    (Original post by kenann)
    yes, you can resit ind papers C1 or C2
    Somewhat relieving, thanks
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    Any speculation as to what's required for 100ums?
    72? or do you think lower is viable?
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    For the question:
    sin b =3/7 . what is cos b equal too considering it is an obtuse angle
    i did c=sqrt(a^2+b^2)
    sin = opposite/hypotenuse
    so the adjacent length is 2*sqrt(10)
    cos=adjacent/hypotenuse
    so, cos b = 2*sqrt(10)/7
    the angle is obtuse so,
    pi-(2*sqrt(10)/7)= cos b (as an integer, 154 degrees)

    is this definitely the right answer?
    also i did all that but i put:
    pi+(2*sqrt(10)/7)
    Do you think ill only lose one mark?



    Also on question 9, it said: 'List the values of y which allow the sequence to have a sum to infinity'
    (or words to that affect)

    i put 0<y<1 because a log cannot be a negative value

    Anyone got an unofficial mark scheme by any chance?
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    (Original post by h2shin)
    Any speculation as to what's required for 100ums?
    72? or do you think lower is viable?
    it's happened when 71 merited 100, and it's a relatively difficult paper so it's certainly possible, you really just have to wait for the grade boundaries and hope for the best, best of luck to you

    (Original post by Scott Lucas)
    Anyone got an unofficial mark scheme by any chance?
    http://www.thestudentroom.co.uk/show....php?t=2004837
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    oh is it 45pie??? I saw it as 45. method was right but only numbers get wrong.How many can I lose?
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    hey , i think i did ok(ish) on C1 and C2 , i am aiming for an A and think i was on the boundaries (High B, Low A) for both this week.... But, i have been doing mocks im stats and been getting around 90% ... could i still realistically get an A overall if i repeat that next week (not sure how the grading system works) thanx
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    (Original post by h2shin)
    was this the trig one? I got -2root10 / 7 don't know where the pi came from
    hahaha that made me laugh i was thinking the exact thingwere did he get the pi from
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    (Original post by safiyasaeed)
    someone I got 14.75 for the radius. Would that be accepted?
    I dont think thats right because the question clearly said the area was 45pi not 45. If the wanted to say 45 radians they would have put the C notation. Radius was 15 because

    45pi = 1/2 x r squared x theta

    so from the previous ques it asked you to convert 72 degrees into radians so you x that by pi/180 you get 2/5pi

    sub in 2/5pi into the area equation

    45pi = 1/2 x rsquared x 2/5pi

    2/5pi x 1/2 is pi/5

    so 45pi = pi/5 r squared

    multiply by 5

    so 225pi = pi r squared

    divide by pi(so the pi's cancel out)

    225= r squared

    so r = 15cm
    Hope that helped
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    what's usually an A? Around 57 - 62?
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    (Original post by peachesandcream77)
    what's usually an A? Around 57 - 62?
    think 58 for an A, its usualy 80% but sometimes they can say 57 is an A so i guess just depends on what they decide but if you look at the most recent grade boundaries for jan 2012 it was 60 for an A in c2 but thats higher than normal xD
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    there's a poll to see how well u did: http://www.thestudentroom.co.uk/show....php?t=2005689

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