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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by TrentL)
100 ums was 75/75 last year i think 70 was around 94 might be wrong though
depends on the paper and the year i did a mock in class and got 74/75 and it was 98UMS
2. (Original post by Abbey.)
i can do 9 in a sec if you want
thank you very much Abbey and yes that would be amazing!
Hopefully that'll lower the UMS
Spoiler:
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Just kidding hehe
4. I think I'm going to stay up all night doing past paper questions, will anyone else be?
5. 9ii
6. Good luck guys
7. Could someone please explain what they did here?

Attachment 403119403123
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8. I only have four students on this paper tomorrow and they are all strong.

Therefore, I hope the paper is disgusting!
9. I got 70/75 on 2 C2 papers today so hopefully, given the exam tomorrow isn't hard af, I can get an A
10. I still don't get when we use an^n or an^n-1

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11. Anyone??
12. (Original post by Bloom77)
I still don't get when we use an^n or an^n-1

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It's really up to you. Generally we use n-1 because we start with a, and the 2nd term has ar, third term ar^2.
Sometimes with years (often if it starts in year 2000) it's easier to start on year 0 (and use ar), even if it's more confusing. If you're not sure, stick with ar^(n-1)
13. (Original post by havok121)
Anyone??
What's the questions

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14. (Original post by Brony69)
I think I'm going to stay up all night doing past paper questions, will anyone else be?
i defo will be
15. (Original post by havok121)
Could someone please explain what they did here?

Attachment 403119403123
Looks to me like he's done this:

Multiplied by 3^x on both sides to get rid of the fraction, which makes it 2*(3^x)^2
Then he has expanded the bracket and indices to make 3^2x
Divided by 2 to get x on one side
Logged both sides
Made it equal to x and then put it into the calculator
16. (Original post by LearningGeek)
oh so if you screwed up AS your screwed for the course you want in uni
Not exactly. Its you overall grade that counts. Not just one exam.
17. (Original post by Bloom77)
I still don't get when we use an^n or an^n-1

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If the question is asking to find a or the common ratio, I basically find these values and I plug them into both equation and see which one gives out either the first term or 2nd term.
18. (Original post by Bloom77)
I still don't get when we use an^n or an^n-1

To avoid confusion, you should always use when calculating the term you want. As long as the correct values are used, you will get the correct answer. The only benefit of changing this formula to is when you have confusing values of (such as years). If you are unsure, try to stick to the equation shown in the formula booklet as it will work fine.
19. I've done so many past papers (from Edexcel, AQA, OCR and some harder ones), that my confidence has started shrunk, despite scoring 69+ on everyone of them. O_O
20. (Original post by coefficient)
9ii
Where's the sector on your drawing? But confused.

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