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# Oxford MAT 2013/2014 Watch

1. (Original post by Papazachariou)
instead of a minus you can simply take the absolute value of the integral from k to 2 (which will always be positive, as the area has to e positive)
that's what we did in my Math HL class... Still could be wrong but in the end gives out the same result
I think putting a minus in these is much simpler than getting absolute value functions involved, which really aren't necessary in this case since it's clear that the second integral is always negative.
2. (Original post by dutchmaths)
But wasn't that the point? They never said that the area had to be positive. Also, I'm fairly sure I forgot one part of this question, would you mind filling me in? Something about fk-2(x)=-fk(x)
There is no such thing as negative area, so if they said give a function for the area between 0 and 2, you would have to consider the positive and negative areas separately, since integration doesn't give you area, it gives you signed area, which is quite different. If they were just interested in the signed area, then they obviously wouldn't have asked you to express it using 2 different integrals.

I'm a Cam applicant so didn't do the MAT, so unfortunately I can't help with the filling in.
3. (Original post by Tarquin Digby)
There is no such thing as negative area, so if they said give a function for the area between 0 and 2, you would have to consider the positive and negative areas separately, since integration doesn't give you area, it gives you signed area, which is quite different. If they were just interested in the signed area, then they obviously wouldn't have asked you to express it using 2 different integrals.

I'm a Cam applicant so didn't do the MAT, so unfortunately I can't help with the filling in.
Well, this just makes me sad. This is probably a language problem and likely something I would have caught if the test were in Dutch. I think I did fairly well on the rest of the question though. (I hope)
4. (Original post by dutchmaths)

While I'm at it, here's a sketch of question 2. Again, I'm hoping people will reply to this comment and expand on it/correct me.

Q2:
(i) For k=/=±1, we have a function f(x) that satisfies:
f(x)-k*f(1-x)=x
Find f(x) by replacing x with 1-x

I was absolutely clueless on this one. The answer I ended up giving was k=0 and f(x)=x, which technically is correct, but probably not what they were looking for.

(ii) We redefine the function f(x) as follows:
f(x)-f(1-x)=g(x)
Show that there is no solution for f(x) if g(x)=x

I solved this by replacing x with 1-x, and proving some paradoxical property of x. I think it was x=-(1-x)=x-1. I don't quite remember, though, and my answer might not have been correct.

(iii) What condition does g(x) have to satisfy for there to be a valid f(x)?

The answer I ended up giving was: g(x) has to be a polynomial with components of an even degree. I figured this was the only way this weird type of symmetry would crop up. Again, I probably had this wrong.

(iv) What is f(x) if g(x)=(2x+1)3?

I had no idea. Also, the g(x) I give here is probably incorrect, but it was something similar to this.
For part (i):

Substitute to get

Multiply both sides by to get

Add this to the first equation to get

5. (Original post by dutchmaths)

While I'm at it, here's a sketch of question 2. Again, I'm hoping people will reply to this comment and expand on it/correct me.

Q2:
(i) For k=/=±1, we have a function f(x) that satisfies:
f(x)-k*f(1-x)=x
Find f(x) by replacing x with 1-x

I was absolutely clueless on this one. The answer I ended up giving was k=0 and f(x)=x, which technically is correct, but probably not what they were looking for.

(ii) We redefine the function f(x) as follows:
f(x)-f(1-x)=g(x)
Show that there is no solution for f(x) if g(x)=x

I solved this by replacing x with 1-x, and proving some paradoxical property of x. I think it was x=-(1-x)=x-1. I don't quite remember, though, and my answer might not have been correct.

(iii) What condition does g(x) have to satisfy for there to be a valid f(x)?

The answer I ended up giving was: g(x) has to be a polynomial with components of an even degree. I figured this was the only way this weird type of symmetry would crop up. Again, I probably had this wrong.

(iv) What is f(x) if g(x)=(2x+1)3?

I had no idea. Also, the g(x) I give here is probably incorrect, but it was something similar to this.
for the 3rd part, i got g(x) + g(1-x)=0

also for q4, how did you transform the graph of fk(X) to that of F2-k(X)?
6. (Original post by dutchmaths)
What did people get on the first question? I was fairly sure is was a>2 but now I'm not sure anymore.
Could we set up a document of all multiple choice questions and the answers that everybody agrees on? I'm sure our collective memory is good enough to remember all the questions!
I had a>2 aswell. But I'm not so sure anymore either and I can't remember the exact question.
I'm confident I have 2 answers correct in multichoice - sinx+4 and 28. What is life?
I had a>2 aswell. But I'm not so sure anymore either and I can't remember the exact question.
I'm confident I have 2 answers correct in multichoice - sinx+4 and 28. What is life?
I discussed it with a friend and she was right, I chose a>2 while she chose a/=2.

Sent from my GT-N7100 using Tapatalk 4
8. (Original post by seohyun)
I discussed it with a friend and she was right, I chose a>2 while she chose a/=2.

Sent from my GT-N7100 using Tapatalk 4
Think I better change my vote in the poll from 61-70 to 51-60. Ha.
9. (Original post by President Snow)
Yes, usually slightly higher. They also assured someone else here a couple of years ago that they definitely do not compare scores across different applied for degrees, not that anybody necessarily expected them to.
Just to clear this up -- as you all will have seen when you took the paper on Wednesday, Maths and Computer Science, Computer Science, and Computer Science and Philosophy applicants do different questions to Maths, Maths and Stats, and Maths and Philosophy applicants.

As such, the marks aren't directly comparable and the threshold is chosen separately. There's no systematic reason that one of the thresholds should be higher. Hope that helps!
10. (Original post by OxfordMathsDept)
Just to clear this up -- as you all will have seen when you took the paper on Wednesday, Maths and Computer Science, Computer Science, and Computer Science and Philosophy applicants do different questions to Maths, Maths and Stats, and Maths and Philosophy applicants.

As such, the marks aren't directly comparable and the threshold is chosen separately. There's no systematic reason that one of the thresholds should be higher. Hope that helps!
will the answers to the paper be published on the website soon?
11. (Original post by OxfordMathsDept)
Just to clear this up -- as you all will have seen when you took the paper on Wednesday, Maths and Computer Science, Computer Science, and Computer Science and Philosophy applicants do different questions to Maths, Maths and Stats, and Maths and Philosophy applicants.

As such, the marks aren't directly comparable and the threshold is chosen separately. There's no systematic reason that one of the thresholds should be higher. Hope that helps!
Hi, do you have any idea when we'll be told if we're wanted for interview or not?
12. (Original post by Titus20)
Hi, do you have any idea when we'll be told if we're wanted for interview or not?
If the last five years are anything to go by, end of November to the first week of December.
13. (Original post by Noble.)
If the last five years are anything to go by, end of November to the first week of December.
Thank you.
14. (Original post by kapur)
will the answers to the paper be published on the website soon?
If by soon you mean the next 4-12 months, then yes

When I was applying I'm pretty sure the solutions didn't appear until way after all decision were made (it might not have been until the start of the academic year of entry actually).
15. (Original post by OxfordMathsDept)
..
and i also have a query- if you have the correct working out for a multiple choice question but pick the wrong answer will your effort be recognised?
One question said- for what values of 'a' are there distinct roots?
got
(a-2)^2 > 0

and deduced that is so for all a forgeting it said distinct so when a=2 it becomes 0 so answer is a/=2.

Will I really be punished for this so heavily- or will my working get credit- its so unfair that little slips but general good understanding can be punished heavily by losing a good 4 marks.
16. (Original post by President Snow)
Also, according to my maths teacher, when providing feedback after the process is over, for the first year ever, they will NOT be releasing our MAT scores. Apparently every other admissions test (ELAT, PAT, CAT, BMAT, TSA, etc.) will still provide raw marks, but we will never get our marks back.

Anyone else heard this or have a reliable source?
Somebody correct me if I'm wrong but I thought you never get your MAT score back unless you ask the college you interviewed at directly. Some colleges have a policy of not giving successful applicants their marks back as well.
17. (Original post by Blazy)
Somebody correct me if I'm wrong but I thought you never get your MAT score back unless you ask the college you interviewed at directly. Some colleges have a policy of not giving successful applicants their marks back as well.
I think it is because there may psychological effect on the undergraduate when they start uni courses- if they got low- they may think they are the worst of the bunch that got in and feel intimidated by other students- and obviously the converse for those who do well - something like that I suspect anyway
18. (Original post by nahomyemane778)
and i also have a query- if you have the correct working out for a multiple choice question but pick the wrong answer will your effort be recognised?
One question said- for what values of 'a' are there distinct roots?
got
(a-2)^2 > 0

and deduced that is so for all a forgeting it said distinct so when a=2 it becomes 0 so answer is a/=2.

Will I really be punished for this so heavily- or will my working get credit- its so unfair that little slips but general good understanding can be punished heavily by losing a good 4 marks.
Given that they ask you to put rough working between each part for the multiple choice would suggest that they do look at your rough working, however, it also says that marks are only given for correct answers so you will lose 4 marks for this question.
19. Was that graph Q Q4? Oh my. I swear it was 3 as I attempted it?...I'm M+CS.

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20. (Original post by yl95)
Was that graph Q Q4? Oh my. I swear it was 3 as I attempted it?...I'm M+CS.

Posted from TSR Mobile
Yes it was Q3.

Q4 was about a region of a disc.

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