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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Still it is encouraging.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**zetafunc.****Guest**

Yes, it is encouraging. If only they gave out proper Mark schemes so you'd know exactly what mark you got, rather than an estimate...

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Nobody at the TSR took any of the probability questions you mentioned?

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**zetafunc.****Guest**

There isn't a solution thread for 2010, because official mark schemes started in 2008.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi;

Okay, I did not know that.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**zetafunc.****Guest**

For some reason I am finding STEP I 2011 a lot harder than STEP III 2010. The grade boundaries indicate that the former is much easier...

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Might mean you are weaker in those particular type questions.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

Yes, that is probably true. Some of these things can be terribly fiddly though.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

I couldn't agree more. I was just working on a marbles in the urn problem. After 10 or 12 mistakes I got the right answer.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

What makes it worse is the time limit. You have to try the right thing, otherwise you risk wasting time which could seriously hinder your performance...

Is the marbles in an urn question from STEP?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

No, somehow it is worse. Those problems you at least know that somewhere, somehow there should be a solution to them. This problem came from his head and therefore always has the lurking danger that it is unbelievably difficult or impossible. Luckily, this one has a solution.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

Oh, I thought it was a textbook problem or something.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

I have seen some textbooks that pose research type problems in the exercises but I think that is a little too much.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

Oh, I know what you mean, like those extension puzzles you have at the end of an exercise? I had a similar experience with one such 'impossible' question... I did the Tower of Hanoi puzzle, which was just finding the optimal solution for n discs. But when that was extended to n discs and p pegs, that became really, really difficult. Only found out that it was an unsolved problem a year later.

E-mail from Katie, after 11 days... (I wasn't counting, I just checked the date of the last e-mail):

---

"Hi!

We haven't emailed recently, which is almost certainly my fault for forgetting to reply at some point.

How are you?"

---

She seems to want to keep in contact for some reason.

**skavorn****Member**- Registered: 2013-04-28
- Posts: 1

Sorry for gatecrashing this thread but it wouldn't let me post a new thread for antispam restrictions for some reason although I'm registered with a confirmed email...

anyway here's my problem...

------------

Ok what I'm trying to do is create a table where football tactics counter each other in a numbered order. Such as like a filled in order of the below table...

This can be simplified into a 7x7 matrix table such as the below (by renaming the tactics, 1-7)

We have 3 rules that need to be adeared to:

1) There needs to be a different tactic in each row and each column. Essentially making like a sudoku puzzle.

2) Rows can't have the same 2 numbers reversed. i.e. 6, 7 should not be 7,6 elsewhere

3) Every number entered needs to have it's opposite entered. i.e. if Attacking is 2nd strongest vs Balanced, then Balanced is 2nd weakest vs Attacking. Here's an illustrated example...

I've been using this to assist me http://www.poisonmeatball.com/kenken/, however it doesn't take additional rules 2 & 3 into consideration.

Is this solvable?

*Last edited by skavorn (2013-04-28 03:12:18)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi skavorn;

There is no reason why you can not start a new thread in "Help Me".

Please start it there and I will paste the contents from this post there.

Hi zetafunc;

Hmm, I wonder why? What do you think?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

It must mean she enjoys talking to me... but that's one thing I didn't really understand. She didn't talk to me that often, usually a reply every couple of days, sometimes a reply once a week. She hasn't talked about meeting up with me yet, either... it has been 6 months since I last saw this girl.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

I got a call from one after 7 years of her not even returning a thank you for the birthday cards I sent her. They are kooky.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

Oh dear, so then I could get a knock on the door from H in 7 years' time...

So what do I do about Katie?

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Well, unless you want be like that girl who thought 7 years was not too long then you should answer.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

OK, but should I ask to meet up with her at any point post-exams? In our discussion before you said that I shouldn't because she has not made any indication that she wanted to do that.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

When does she want to meet up then?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

She hasn't asked to meet up...

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Well if, there is no post exam meetings, no pre exam meetings, when do you meet?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**zetafunc.****Guest**

We meet if I say to her that I want to meet after the exam season. But I don't know if I should ask her.