[richardhamblyn1993]

Hi everyone,
These are photos of my FP1 exam paper.
Question 6a I lost a mark but don't know why? Can someone help me out, I am about retake it in a week...

[GreenLantern1]

Stupid marker! It is full marks. Get it remarked

[tommm]

I'm no expert on exam marking but I'll try to answer anyway. If you dropped a single mark, it must've been the final "A1cso" mark, because it is dependent on the previous 4 marks. Hence the examiner must've deemed that you didn't provide a "fully complete proof with no errors and comment". My guess is that you'd've got that mark had you explained clearly in full sentences what you were doing at each stage.

[richardhamblyn1993]

I know that's what I thought!
But I was also marked down on 7b, which was a similar question...Should I have been?...

[Mariah246]

(Original post by richardhamblyn1993)
Hi everyone,
These are photos of my FP1 exam paper.
Question 6a I lost a mark but don't know why? Can someone help me out, I am about retake it in a week...

Looks right to me, how long did it take to get your paper back?

[Nick_]

What exam board, the conclusion would not be good enough for edexcel.

[richardhamblyn1993]

(Original post by tommm)
I'm no expert on exam marking but I'll try to answer anyway. If you dropped a single mark, it must've been the final "A1cso" mark, because it is dependent on the previous 4 marks. Hence the examiner must've deemed that you didn't provide a "fully complete proof with no errors and comment". My guess is that you'd've got that mark had you explained clearly in full sentences what you were doing at each stage.

Ok thanks, that would explain me losing the similar mark

[richardhamblyn1993]

yes it was excel, the teacher had drilled into us that conclusion! Oh well

[GreenLantern1]

(Original post by Nick_)
What exam board, the conclusion would not be good enough for edexcel.

You can obviously tell it is Edexcel by the format of the answer paper. That is edexcel style.


OP this person believes they know why you lost the mark

[richardhamblyn1993]

(Original post by Mariah246)
Looks right to me, how long did it take to get your paper back?

I got it a while back, just assumed the marking was right, was going to use it for revision nearer the retake, ie now.

[tommm]

(Original post by richardhamblyn1993)
I know that's what I thought!
But I was also marked down on 7b, which was a similar question...Should I have been?...

My previous comments apply to this one, too.

I don't know how strict examiners are at this level, but purely from my point of view there's a niggling doubt that you might've just memorised the method for doing this sort of question without really understanding it. However, writing everything in a simple sentence such as "The statement holds for n = 1, and if it holds for n = k then it holds for n = k + 1, hence by induction the statement holds for all positive integers n" would convince me that you completely understand what's going on.

[richardhamblyn1993]

(Original post by tommm)
My previous comments apply to this one, too.

I don't know how strict examiners are at this level, but purely from my point of view there's a niggling doubt that you might've just memorised the method for doing this sort of question without really understanding it. However, writing everything in a simple sentence such as "The statement holds for n = 1, and if it holds for n = k then it holds for n = k + 1, hence by induction the statement holds for all positive integers n" would convince me that you completely understand what's going on.

Yea true, but they should mark me on what I put down, not what they think i have memorised. I do understand where you're coming from though. Also, it's in maths notation, do they not prefer it to sentences?

[JustAbi]

(Original post by richardhamblyn1993)
Hi everyone,
These are photos of my FP1 exam paper.
Question 6a I lost a mark but don't know why? Can someone help me out, I am about retake it in a week...

You most likely lost the mark because of your conclusion.
I always right:
As the ... has been shown true for n=k+1 assuming it is true for n=k. And has been shown true for n=1 it is therefore true for all blah blah blah...

(Just a guess)

Edit: someone already wrote this :P Never mind
But yeah you should probably write it in a sentence to be safe.

[thefifthfoo]

I agree wit the above replies. In induction questions, k is a defined (but unknown) number that you introduce for the anchor/induction steps of the proof. At the end you need to go back to using n (or whatever letter was in the original question). Writing something like 'Therefore P holds for all n' (where P is the condition you needed to prove) would satisfy this just fine.

[matt2k8]

I think you probably needed to say something like "so if it is true for n =k, it is true for n = k+1. Therefore as it's true for n = 1, it's true for all positive integers n by induction"

[Ree69]

Definitely your conclusion

[TenOfThem]

I would say that you are missing a line was at the start of the k+1 section

Where you need to state that Sum to k+1 = Sum to k + (k+1)^3

[Seanyboy57]

You have to mention the word 'induction' for full marks as far as I'm aware.

[The Polymath]

(Original post by Nick_)
What exam board, the conclusion would not be good enough for edexcel.

hey nicky