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D1 (Decision 1) 17 May 2013 Official Thread

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Reply 700

Arsey

Original post by Vaner

Do you suggest doing solomon now? Also just to clarify, I can do diagrams in pen or pencil?

Thank you!

Arsey recommends a nice dark pencil for all of D1 :wink:

Reply 701

Arsey

Original post by Anythingoo1

Ok thanks alot! Also just to be sure, say the objective line was P = 5x + 7y, and your graph went up in all the way to 60 on both axes, would it be ok to double it (x = 14, y = 10) ?

definitely, they will not accept an objective line if it is too small. It needs to be big enough to follow the gradient through.

Reply 702

Vaner

Original post by Arsey

Arsey recommends a nice dark pencil for all of D1 :wink:

Mind is blown lol. Can we seriously answer in Pencil? :eek:

Reply 703

Flounder1

Original post by Arsey

I agree with you to a certain extent. The Solomon ones are based on old spec, so I went through them and binned all flows and simplex and currect spec questions that were just stupidly hard.

Most of the Solomon questions are fine and help prepare you for the awkward Edexcel questions.

Sir if you were to guess what definitions/explanations would we get in this exam??

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Reply 704

Arsey

Original post by Better

Things just got serious. Arsey is here. :eek4:

Arsey is there a faster way to do Linear Programming Vertex Testing. I just did January 2013 and I finished on time but the Vertex Testing took me a very long time.

Any help would be appreciated.

Ruler method all the way. I only ever paid lip service to ruler method with my students... until Jan... I let out a few expletives when I saw the YOU MUST USE POINT TESTING... :angry:

3-4 marks down the pan for most of mine.

Reply 705

otrivine

Original post by Arsey

technically no, but on one of the past papers they accepted solutions on the dotted line in the answers.

2. flows is unlikely to be on as the sorting algorithms have to be on but it doesn't matter.

Sir do you think for route inspection they could either ask us on if you add this route the length would increase or decrease, or could another option be if G starts here which point will it finish?

Are these 2 the things we always get for route inspection

Reply 706

Arsey

Original post by Flounder1

Sir if you were to guess what definitions/explanations would we get in this exam??

Posted from TSR Mobile

Tree etc or matchings

I think I uploaded my definitions you need to know sheet on the other thread.

Reply 707

Story

Hey guys hope revision is going good! I have a question thats confused me a little on the D1 May 2011 paper. Question 4 about matchings
a) I got A-1 = H-2 and A-1=H-3=C-5 the second one is not on the ms so is it incorrect?
likewise part c) I got J-4=C-3=H-2, which is also not on the ms?
Any help is appreciated!

Reply 708

Arsey

Original post by Vaner

Mind is blown lol. Can we seriously answer in Pencil? :eek:

Of course you can. They prefer black pen because it shows up clearer on their scanners but you can write in luminous pink if you wish, they have to mark it regardless...

that said, it probably isn't wise to annoy a marker. Don't draw them little pictures or write them messages, rarely goes down well.

Reply 709

Pebbles94

Original post by posthumus

Aaaahhhh damn it ! :frown:

But what do they mean by "correct order" :confused:

& Thanks for the response ! :smile:

As soon as you put a final label on a vertex, you put a working value on every vertex that is directly connected to it except the ones which already have final values. Have a look at the steps for Dijkstra's algorithm again if you still don't understand.

Reply 710

Anythingoo1

Original post by Arsey

definitely, they will not accept an objective line if it is too small. It needs to be big enough to follow the gradient through.

Sweet, thanks a bunch, this was the only thing I wasn't sure about up till now and you've explained it brilliantly.

I know there's people here who probably need you more than I do but just quickly which definitions do you think catch people out more, if that even makes sense?

Btw I sent a +rep your way, a lifesaver the way you help on this thread

Reply 711

Better

Original post by Arsey

Tree etc or matchings

I think I uploaded my definitions you need to know sheet on the other thread.

Final Question Arsey, please would you be able to join the C3/C4 Forum and give some wisdom to us wanting to get A*s after the D1 Exam.

The general consensus on the forum has been Solomon Press ---> Real papers will get you to a 100UMS Level but some professional guidance would be great. TinyHobit (also a teacher said she might pop on when she has time).

:ta:

Reply 712

sarahjames123

How do you find the optimal solution using the ruler method if it has to be in integars???????

Reply 713

posthumus

Original post by Arsey

" "

Thank you so much ! :biggrin:

Original post by Pebbles94

Oh okay, I get it now... thanks ! I just haven't had any practice doing so, so now I'm starting to get worried :redface:

Reply 714

tobywalsh

Hello there,
I have a question about a paper I have done previously.

It was the Jan 2010 paper, question 5a on algorithms. I set my answer out differently from the mark schemes and still gave myself full marks.

What I suppose I am asking is when you have an algorithm question and you need to fill in a table, does it matter how you put the values into the table? I tend to write across filling in the boxes across as I go along, but the mark scheme seems to start a line for every box.

Which is the right way?

Many thanks

Toby

(edited 10 years ago)

Reply 715

Westeros

Original post by Story

Part a) You've wrote 3=C in your second one, 3 isn't matched to C, it's matched to R

so it would be A-1=H-3=R-4=C-5

Reply 716

Nitrogen

Does anyone know whether we will need to be able to draw the activity network?

Reply 717

Story

Original post by Westeros

Part a) You've wrote 3=C in your second one, 3 isn't matched to C, it's matched to R

so it would be A-1=H-3=R-4=C-5

thanks for the quick reply im still a little confused though, so part a is wrong?

Reply 718

posthumus

Original post by Nitrogen

Does anyone know whether we will need to be able to draw the activity network?

Fairly possible I would say :smile:

Though I would imagine it must be a pain for the examiner to mark ! Since students will get a variety of funky shapes :tongue:

Reply 719

study beats

I am doing the may 2008 paper and it has some odd questions... can someone tell me if there part of the specification or not...? Like this one....

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