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

1. (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
2. 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

its ok i just realised i had the correct answer all along!!!! silly moi
3. (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?
4. good luck everyone! we WILL pass!
5. (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

its ok i just realised i had the correct answer all along!!!! silly moi
Answers on page 1 to this,
6. 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
8. 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
9. 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
10. (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.
11. 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.
12. (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 !
13. I got ~1.23 for area under graph, same solutions for cubic in cos and perimeter.. don't remember are of shape.
14. (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.
15. When do you guys think mr m will load the answers up??
16. (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
17. (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?
18. (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.
19. what did everyone get for 'c' in the binomial question? i got 24, not sure if it's correct
20. (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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