You are Here: Home >< Maths

# Oxford MAT 2013/2014 Watch

1. Does anyone have any hints for question 7? I'm not really sure where to start with it at all, it doesn't seem to simplify into anything nice.

(Original post by yxcai)
So when we are interviewed those type of questions, we do not have to give the final answer, right?
Most likely so. I'm guessing they gave an integral that can't be solved on purpose, presumably to see how we react when we can't get a solution (and what methods we may think of).

I do hope they don't give me something like that though, that would be terrifying...

(Original post by kapur)
which step exactly do you think is incorrect?
souktik posted the same thing while I was typing a response, but I'll keep it as a spoiler if you want some additional clarification.

Spoiler:
Show
The step where you substitute t=1-ln x. When you differentiate it you get

I've noticed that I've actually made a mistake with my previous post though, I removed the -x on the denominator instead of the numerator. Doing it properly, you get,

Which, you can see is an exponential integral multiplied by -e.
2. (Original post by ctrls)
Does anyone have any hints for question 7? I'm not really sure where to start with it at all, it doesn't seem to simplify into anything nice.

Most likely so. I'm guessing they gave an integral that can't be solved on purpose, presumably to see how we react when we can't get a solution (and what methods we may think of).

I do hope they don't give me something like that though, that would be terrifying...

souktik posted the same thing while I was typing a response, but I'll keep it as a spoiler if you want some additional clarification.

Spoiler:
Show
The step where you substitute t=1-ln x. When you differentiate it you get

I've noticed that I've actually made a mistake with my previous post though, I removed the -x on the denominator instead of the numerator. Doing it properly, you get,

Which, you can see is an exponential integral multiplied by -e.
haha i COMPLETELY screwed that one up. guess i got too excited for a sec
i dont get 7 at all
3. (Original post by ctrls)
Does anyone have any hints for question 7? I'm not really sure where to start with it at all, it doesn't seem to simplify into anything nice.

Most likely so. I'm guessing they gave an integral that can't be solved on purpose, presumably to see how we react when we can't get a solution (and what methods we may think of).

I do hope they don't give me something like that though, that would be terrifying...
For 7, I don't see anything nice either. If we plot an u-v graph where u=x^2 and v=y^2, we'll clearly get 4 circles. Then shifting from u-v to x-y would give us 4 closed figures, but they'll just look weird. Weird, I wonder if I'm missing something.
And for that integral, we can just use the power series of e^x to get the answer as a power series, right? Yes, it'll work only for a short range and won't be an elementary function, but still better than nothing.
4. (Original post by james100)
Hey I saw that you got an interview offer from St Anne's. Congrats. Did you originally apply there? When did you get to hear? I applied there as well but I am still waiting :/
Thanks, yeah I applied there originally for straight maths and I got an email on the 27th, I don't know anyone else who applied there so I don't have any more information.. I'm sure there's no need to worry though it won't be long, good luck!
5. I'm confused with 65:
There is a set of numbers whose sum is equal to the sum of the elements squared. What's bigger: the sum of the cubes or the sum of the fourth powers?
Where should I start?
6. (Original post by IWasAnEagle)
Thanks, yeah I applied there originally for straight maths and I got an email on the 27th, I don't know anyone else who applied there so I don't have any more information.. I'm sure there's no need to worry though it won't be long, good luck!
Yeaah I think they send out the invitations and the rejections all at the same time. I have just e-mailed them about it. Thank you and good luck with the interviews! See you there hopefully.
7. (Original post by kapur)
i hope you dont mind cross checking a couple of
how did you do 9? and id you get 3/5 for 8?
In the ninth one I used the harmonic sequence summation formula(which isn't accurate but that's only in the decimals so won't affect what we're trying to prove ).
I have to re-do the eighth one. I read that one wrong. I thought they were asking the number of combinations. My dislike for probability led ti that, perhaps

Posted from TSR Mobile
8. Hey could someone tell me where to get these interview questions? thanks
9. (Original post by revelry26)
In the ninth one I used the harmonic sequence summation formula(which isn't accurate but that's only in the decimals so won't affect what we're trying to prove ).
I have to re-do the eighth one. I read that one wrong. I thought they were asking the number of combinations. My dislike for probability led ti that, perhaps

Posted from TSR Mobile
Another way to do 9 would be to note that if n lies between 2^k and 2^(k+1), where k is a natural number, then 1/n is less than 1/2^k. So, the given sum is less than 1+1/2+1/2+1/4+1/4+1/4+1/4+1/8...
The sum of the first (2^k-1) terms will clearly be less than k. We're adding up to the 1000th term, while 10 is greater than the sum up to the 1023rd term. So we're done.
What was question 8?

Posted from TSR Mobile
10. Where are these questions coming from? :/
11. (Original post by ftball22)
Where are these questions coming from? :/
A docx file posted a few pages back.

Posted from TSR Mobile
12. does anybody know how we can find out whether we have a pre interview test?
13. (Original post by MEPS1996)
does anybody know how we can find out whether we have a pre interview test?
Go on the college website, and it should be there under the subject page. e.g. http://www.worc.ox.ac.uk/Undergradua...on/Mathematics here it says "The first interview is based on questions distributed beforehand, a selection of which candidates will have been asked to attempt. "
14. (Original post by souktik)
Another way to do 9 would be to note that if n lies between 2^k and 2^(k+1), where k is a natural number, then 1/n is less than 1/2^k. So, the given sum is less than 1+1/2+1/2+1/4+1/4+1/4+1/4+1/8...
The sum of the first (2^k-1) terms will clearly be less than k. We're adding up to the 1000th term, while 10 is greater than the sum up to the 1023rd term. So we're done.
What was question 8?

Posted from TSR Mobile
3 girls and 4 boys were standing in a circle. What is the probability that two girls are together but one is not with them?
This is the 8th q
15. (Original post by hilbert_spaces)
Would CS applicants be asked 'graph sketching' or 'calculus' problems?
I'm also wondering about this. All of the example questions seem to be only logic based, like the last questions on MAT. Should I also brush up on my graph sketching ?
16. (Original post by nZeac)
I'm also wondering about this. All of the example questions seem to be only logic based, like the last questions on MAT. Should I also brush up on my graph sketching ?
Yes.
17. (Original post by nZeac)
I'm also wondering about this. All of the example questions seem to be only logic based, like the last questions on MAT. Should I also brush up on my graph sketching ?
Are you applying to Oriel as well?

Yeah, I am not sure the tutor would ask us standard MATH interview questions. Have you looked into the sample CS interview problems?
18. (Original post by Woostarite)
Yes.
Even for pure CS? Do you know where I can find the 'graph sketching' tutorials? Thanks.
19. (Original post by hilbert_spaces)
Even for pure CS? Do you know where I can find the 'graph sketching' tutorials? Thanks.
They don't ask graph sketching questions in a straight maths interview because graph sketching is a skill you must have as an undergraduate (I mean, I think I've had to draw/sketch a graph once for a problem sheet, and the main point wasn't even to test graph sketching skills). The reason they're generally asked, in my opinion, is because they're a good way to test the interviewee's ability in determining the behaviour of weird functions, and gives somewhat of an insight into the analytical abilities. So there's no real reason why graph sketching questions wouldn't be asked in a CompSci interview.
20. (Original post by Noble.)
They don't ask graph sketching questions in a straight maths interviews.
This isn't true. I know for a fact that graph sketching questions are sometimes asked in mathematics interviews (for those applying for straight maths for example).

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 6, 2014

### Degrees to get rich!

... and the ones that won't

### Women equal with Men?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.