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# Mr M's OCR (not OCR MEI) Further Pure 1 Answers May 2016

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1. Mr M do you have a rough opinion of what the grade for an A may look like?
2. (Original post by Mr M)
I expect so. I think this will be a very common mistake.
how many would i drop in part 8.ii for missing the 2n on top?
3. (Original post by anon326589)
why root5 for 6i)?

Also how do you 10iii)?

Because the diameter is !

You do 10iii) by understanding the connection with 10ii) and 10i).
4. (Original post by emilyp2206)
Just wondering how many marks i would lose for:

7ii) somehow fluffed up my matrix and got

-3 8
0 3

or something, but correctly described what it was and showed methods and everything of how i got there

10ii) didnt do or really even imply over 41 (not sure how i missed that), i identified conjugate root and then the roots of those
7ii) I can't see any marks there but the working on your script might get you something.

10iii) You've probably got 2 marks there.
5. (Original post by proximity)
Mr M do you have a rough opinion of what the grade for an A may look like?
I don't like to guess boundaries.
6. (Original post by ComputeiT)
Thanks again for your answers - would you get ECF for the sum to infinity if you forgot to half the method of differences from 8 part ii?
Wait, why would you half?
7. (Original post by Mr M)
Because the diameter is !

You do 10iii) by understanding the connection with 10ii) and 10i).
oh so you don't include i in the calculation

only just spotted the connection

thanks
8. (Original post by ComputeiT)
how many would i drop in part 8.ii for missing the 2n on top?
Probably just 1.
9. (Original post by SGHD26716)
Wait, why would you half?
You were summing half of the expression you derived in i).
10. (Original post by SGHD26716)
Wait, why would you half?
in 8i) you found 2/(2r+1)(2r+3)
in 8ii) you are asked to use method of differences for 1/(2r+1)(2r+3) which is half of part i)

Hope this helps
11. (Original post by Kyrus)
For question 8 part ii if you did everything correct and just forgot to halve how many marks do you think you would lose
Just 1 mark I expect.
12. (Original post by Mr M)
You were summing half of the expression you derived in i).
Damn it I didn't half
13. (Original post by SGHD26716)
Damn it I didn't half
I expect about half of the candidates will be in the same position. Don't worry about it.
14. 8ii) how many marks would you lose if your answer was 1/6 - 1/(4n+6) and how many marks would you get in 8iii) because i must have carried on the error

15. At this rate I've got around 63 marks
16. (Original post by anon326589)
8ii) how many marks would you lose if your answer was 1/6 - 1/(4n+6) and how many marks would you get in 8iii) because i must have carried on the error

Drop 1 mark in ii) and another in iii). Both parts asked for a single fraction.
17. Hard paper for OCR?
18. (Original post by Mr M)
Drop 1 mark in ii) and another in iii). Both parts asked for a single fraction.
thanks
19. (Original post by TeeEm)
Hard paper for OCR?
No - normal difficulty.
20. How many marks do you think I will lose if I put root 3 +3i for question 2i and therefore got an incorrect answer for part ii as I rationalised the wrong thing?

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