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# Edexcel FP1 Thread - 20th May, 2016 watch

1. (Original post by Zacken)
Perfect again!
you're an actual lifesaver ty
2. (Original post by emilysmith268)
you're an actual lifesaver ty
No worries! Good luck for your exam.
3. Have you got any tips for questions like Q9 (ii), June 2014 IAL paper? When you prove for n =k+1 do you try rearrange your expression so you can sub back in your assumption for n=k?
4. Please could someone check my working and see if my answer is correct for part b, there's no MS unfortunately. Thanks Attachment 531751531753
Attached Images

5. (Original post by alfmeister)
I got to the second last bit just before you obtained -1/pq, however I am struggling to see how you can cancel out because on top you have 4q - 4p and on the bottom 4p - 4q. I might just be missing something obvious.
Hey, have you done part b of this question? If so, please could you post your working for it, struggling with it
6. For proof by induction divisibility questions, I found this in a mark scheme. Can you do this all the time, or only certain circumstances? It looks a lot simpler than the f(k+1)-f(k) method, but this method isn't in the mark scheme all the time.
Attached Images

7. (Original post by economicss)
Please could someone check my working and see if my answer is correct for part b, there's no MS unfortunately. Thanks Attachment 531751531753

Could you explain to me why its - 2^r for part a?
8. (Original post by emilysmith268)
For proof by induction divisibility questions, I found this in a mark scheme. Can you do this all the time, or only certain circumstances? It looks a lot simpler than the f(k+1)-f(k) method, but this method isn't in the mark scheme all the time.
You can do this all the time, yes. It's just thatin some cases this approach is far easier and in others the approach is easier.
9. (Original post by alfmeister)
Could you explain to me why its - 2^r for part a?
I made it +2^r for part a, is that what you got aswell? I think the question may be wrong!
10. (Original post by emilysmith268)
For proof by induction divisibility questions, I found this in a mark scheme. Can you do this all the time, or only certain circumstances? It looks a lot simpler than the f(k+1)-f(k) method, but this method isn't in the mark scheme all the time.
It is actually a lot simpler than the other method. Instead of working out whether f(k+1) + f(k) or f(k+1) - f(k) is suitable, you'll just have to find an instance within the f(k+1) expression where a multiple of f(k) and a number which is divisible by whatever you are trying to prove is found (in this case 12). You'll also find that on physicsandmathstutor.com, in all the model answers for FP1 proof of divisibility questions, this is the method used, not the f(k+1) +/- f(k) approach
11. (Original post by economicss)
Please could someone check my working and see if my answer is correct for part b, there's no MS unfortunately. Thanks Attachment 531751531753
Zacken Please could you have a look, thanks
12. (Original post by economicss)
Please could someone check my working and see if my answer is correct for part b, there's no MS unfortunately. Thanks Attachment 531751531753
i understand that you're substituting the values of n^2 and 2n for the two equations, but shouldn't you then also be substituting them into n^2 at the start of the two equations?
13. (Original post by economicss)
Zacken Please could you have a look, thanks
I don't think so? I can't read/understand it very well though. It should be as below:

Note that I had to split the last line into two because of how long it was.
14. (Original post by Zacken)
I don't think so? I can't read/understand it very well though. It should be as below:

Note that I had to split the last line into two because of how long it was.
Great thanks, silly mistake!
15. (Original post by techfan42)
i understand that you're substituting the values of n^2 and 2n for the two equations, but shouldn't you then also be substituting them into n^2 at the start of the two equations?
Thank you, yes you're right silly mistake!
16. (Original post by Zacken)
I don't think so? I can't read/understand it very well though. It should be as below:

Note that I had to split the last line into two because of how long it was.
Do we need to know the geometric series formula for this exam??
17. (Original post by thesmallman)
Do we need to know the geometric series formula for this exam??
Uh, yes - of course. It's given in the formula booklet, though.
18. (Original post by Zacken)
Uh, yes - of course. It's given in the formula booklet, though.
Ah damn, our teacher never taught it to us for this unit- wasn't mentioned once in the textbook as well! -gotta read up now
19. (Original post by thesmallman)
Ah damn, our teacher never taught it to us for this unit- wasn't mentioned once in the textbook as well! -gotta read up now
It'll take about 5 minutes to learn, it's really nothing major.
20. I am resitting FP1, haven't looked at the textbook since last year or done any revision.

I was thinking of trying to learn it two days before the exam, any tips for cramming? haha

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