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# Edexcel AS Mathematics C2- 25th May 2016 Thread

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1. (Original post by 4nonymous)
How do you prove the sum to infinity of a geometric sequence (if we need to know it?)
Take the normal sum and let so that and you get the sum to infinity.
2. I found this binomial expansion question from the June 2014 IAL paper:

Given that 1 + 12x + 70x2 + …

is the binomial expansion, in ascending powers of x of (1 + bx)n, where n (*insert symbols*)and b is a constant,

(a) show that nb = 12 [ 1 mark ]

(b) find the values of the constants b and n. [ 6 marks ]

Do you think something like this may be in the exam on Wednesday?
Spoiler:
Show
How do you do part (b) ?
3. (Original post by jessyjellytot14)
I found this binomial expansion question on the June 2014 IAL paper:

Given that 1 + 12x + 70x2 + …

is the binomial expansion, in ascending powers of x of (1 + bx)n, where n (*insert symbols*)and b is a constant,

(a) show that nb = 12 [ 1 mark ]

(b) find the values of the constants b and n. [ 6 marks ]

Do you think something like this may be in the exam on Wednesday?
Spoiler:
Show
How do you do part (b) ?

You do the same thing for the term and then solve simultaneously

Edit: It's probably worth noting that IAL papers are a little bit tricker than UK papers, this is represented in questions like these
4. (Original post by Euclidean)

You do the same thing for the term and then solve simultaneously

Edit: It's probably worth noting that IAL papers are a little bit tricker than UK papers, this is represented in questions like these
use the long method of working it out and you should get two equations, and IAL papers are becoming more similar to the UK papers. E.g. the c1 paper the other day had the same type of discrimimant question on jan 2016 ial
5. someone post the JAN 2016 IAL c12 paper please, I cant find it anymore
6. (Original post by imran_)
E.g. the c1 paper the other day had the same type of discrimimant question on jan 2016 ial
And rightfully so, C1 has become too easy
7. Hi fellow AS kids (who have exams other than Maths this week), how are you studying for C2? Anyone just gonna flip through the textbook on the morning of the exam?
8. (Original post by imran_)
someone post the JAN 2016 IAL c12 paper please, I cant find it anymore
Go to Physics and Maths Tutor website. Some the Jan IAL papers have been posted.
9. (Original post by jessyjellytot14)
I found this binomial expansion question from the June 2014 IAL paper:

Given that 1 + 12x + 70x2 + …

is the binomial expansion, in ascending powers of x of (1 + bx)n, where n (*insert symbols*)and b is a constant,

(a) show that nb = 12 [ 1 mark ]

(b) find the values of the constants b and n. [ 6 marks ]

Do you think something like this may be in the exam on Wednesday?
Spoiler:
Show
How do you do part (b) ?
I don't think it will be asked. In the exam they either ask you to find the first three, four terms of the expansion, and could either ask you give the estimation for instance.
10. (Original post by oni176)
I don't think it will be asked. In the exam they either ask you to find the first three, four terms of the expansion, and could either ask you give the estimation for instance.
it can be asked, its never come up and it gives them a reason to ask this.
11. (Original post by imran_)
do madasmaths papers, you'll feel more prepared.
These papers are designed to test every every part of the spec in depth. Theyre good practise
(Original post by rosemondtan)
Try IYGB papers S and T, if you can complete them, you can do anything
I just finished the S and T papers, at first they seem hard, but it's really just the way the questions are worded. Once you get through that, the papers are as easy to solve as any regular past paper from edexcel
12. (Original post by rosemondtan)
Hi fellow AS kids (who have exams other than Maths this week), how are you studying for C2? Anyone just gonna flip through the textbook on the morning of the exam?
I'm doing the newest possible papers, because even though I have chemistry and physcis, I still want to improve my maths in general. I suggest you at least do one paper to get the feel. I've been doing papers for the past week!
13. Attachment 536727536729

With this question, I don't understand how the geometric progression forms? I mean with ((1250 x 1.06) + 1250) x 1.06, when 1250 is factorised out isn't the +1250 missed out??
Attached Images

14. (Original post by Saywhatyoumean)
Attachment 536727536729

With this question, I don't understand how the geometric progression forms? I mean with ((1250 x 1.06) + 1250) x 1.06, when 1250 is factorised out isn't the +1250 missed out??
At the end of the first year we have , at the end of the second year we have etc...

Simplifying:

It's clear therefore that

Now at the start of a year we add 1250, so for the nth year, the value at the start is

So for the third year it's:

And the nth year:
15. (Original post by Euclidean)
At the end of the first year we have , at the end of the second year we have etc...

Simplifying:

Now at the start of a year we add 1250, so for the nth year, the value at the start is

So for the third year it's:

Thank you I think I tried to add all the individual terms as well, but that makes more sense
16. (Original post by Saywhatyoumean)
Thank you I think I tried to add all the individual terms as well, but that makes more sense
I've made a couple of amendments to clarify some of the points, hope that clears it up a little. It may help to break down the problem bit by bit so consider the end of the year as I have done when the interest is applied and then look at how that changes when we see the start of the next year (changes by adding 1250)
17. (Original post by techfan42)
I finished all the normal past papers, but going to do the IALs and solomon now
How have you finished all the normal past papers aren't there like 20? When did your school finishing teaching you C2
18. What is everybody's plan today and tomorrow b4 C2 exam?

My plan Today:
- 4:30-6:30pm = recap C2 trig/Calculus & go through every past paper q on examsolution.
- 6:30pm-8:00pm = x1 edexcel C2 pp.
- 8:00-12:00am = recap every single unit 1 physics past paper (both edexcel+IAL) + recap shap theory.
- 12:00-1:00am = recap m1 dynamics b4 Physics exam.

Tomorrow plan:
- x8 C2 exam past papers = x5 edexcel, x2 IAL, x1 madasmaths pp. ---->
^ 8 x 1.5h = 12 hours ---> all day I guess the faster I complete them the longer breaks I'll have at the end.
9/9 C2 past papers to be completed for Wednesday exam.

No gym for me today or tomorrow. #ripgains

19. (Original post by XxKingSniprxX)
- x8 C2 exam past papers = ---->
^ 8 x 1.5h = 12 hours ---> all day I guess the faster I complete them the longer breaks I'll have at the end.
9/9 C2 past papers to be completed for Wednesday exam.
Be careful to not overdo it, the killer in C2 is usually silly mistakes rather than lack of knowledge

Advice for the exam: Take it at quite a quick but accurate pace, make sure you finish ahead of time and check literally every single thing ( etc..)

Good luck

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