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Edexcel D1 - 17th June, 2016 [Exam discussion]

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How long does a D1 paper normally take you?
And if they ask you for the reason for using dummies, how do you word it, assuming it's not the dependacy reason?

"Activity A and B can't have the same head node and tail node as activities have to be represented uniquely in terms of their end events".

D1 papers take me about 50 minutes, but sometimes up to 75 minutes for a harder paper.

(edited 7 years ago)

Reply 281

Glavien

Original post by NotNotBatman

Let P = ax+3ay for any value of a. (a is the cost)

You could use the working values. If that doesn't work, say you needed to find the shortest from s to t via f. Find the shortest from f to t, then the shortest from s to f.

Thanks, but shouldn't it be P = 3ax+ay ??

Reply 282

NotNotBatman

Original post by Glavien

Thanks, but shouldn't it be P = 3ax+ay ??

the cost of a green hat is 3 times the cost of a red hat, so if the cost of a red hat is

a

, then the cost of a green hat is

3a

, so P=ax+3ay .

Reply 283

techfan42

Original post by NotNotBatman

the cost of a green hat is 3 times the cost of a red hat, so if the cost of a red hat is

a

, then the cost of a green hat is

3a

, so P=ax+3ay .

Hi, how are you studying for D1, doing papers or going through the textbook? Its so hard because there aren't even any solomon papers or anything

Reply 284

NotNotBatman

Original post by techfan42

Hi, how are you studying for D1, doing papers or going through the textbook? Its so hard because there aren't even any solomon papers or anything

I had a quick read through the textbook, just to recap; now I'm just doing past papers, I think the past papers are sufficient, there's about 19 of them.

Reply 285

Pablo Picasso

Original post by Student403

2 hours lol I'm f***ed

Dummy enables unique representation of activities in terms of their end events

Lol, slow and steady wins the race they say

Reply 286

Student403

Original post by Pablo Picasso

Lol, slow and steady wins the race they say

True but those races don't have time limits :lol:

Reply 287

kennz

is there a maximum amount of comparisons for quick sort? @NotNotBatman

Reply 288

Pablo Picasso

Original post by NotNotBatman

I had a quick read through the textbook, just to recap; now I'm just doing past papers, I think the past papers are sufficient, there's about 19 of them.

semi eulerian means 2 odds nodes?

Reply 289

NotNotBatman

Original post by kennz

is there a maximum amount of comparisons for quick sort? @NotNotBatman

Dunno, it's not in the textbook as far as I know.

Original post by Pablo Picasso

semi eulerian means 2 odds nodes?

Odd valency, Yes.

Reply 290

Glavien

Has anyone got the answer booklet for the June 2015 paper? I can't find it anywhere.

Reply 291

techfan42

Original post by NotNotBatman

I had a quick read through the textbook, just to recap; now I'm just doing past papers, I think the past papers are sufficient, there's about 19 of them.

Yeah, same I read the textbook two times, but after a while the past paper questions seem so repetitive and conventional, and judging by other papers,the questions this time might be a bit different and harder.

Reply 292

techfan42

Original post by Glavien

Has anyone got the answer booklet for the June 2015 paper? I can't find it anywhere.

https://drive.google.com/folderview?id=0B23NLD5L6099fi03eUFoOG1pUWdqalhQX3dDQU9KclRtX01vbGdGaFBlWGVsTkcwVkNaQlU&usp=sharing&tid=0B23NLD5L6099fmRyZWJXa0tmT3RhNW4ybU9TWjNhMkhQVGxMcHp4Zk5ISjN1VGxGdzZXbFE

Reply 293

NotNotBatman

Original post by Glavien

Has anyone got the answer booklet for the June 2015 paper? I can't find it anywhere.

On the edexcel website, scroll down the answer booklet is there.

http://qualifications.pearson.com/content/dam/pdf/A-Level/Mathematics/2013/Exam-materials/6689_01_que_20150609.pdf

Reply 294

gekkelekkebekke

anyone else that is worried about them throwing in unusual questions? feel like I'm prepared but what could they possibly ask that has never come up before?

ps who else hates linear programming? :angry:

Reply 295

Pablo Picasso

Original post by NotNotBatman

Dunno, it's not in the textbook as far as I know.

Odd valency, Yes.

Quick sort: do you need to do a pivot even tho a certain section is clearly sorted?

Reply 296

Pablo Picasso

Original post by gekkelekkebekke

Define valency.
3 differences between Prim's & Kruskal's?

Reply 297

Pablo Picasso

If y > 5, for example, does it have to be dotted if they ask you to show the R region

Reply 298

gekkelekkebekke

Original post by Pablo Picasso

Define valency.
3 differences between Prim's & Kruskal's?

just off the top of my head:

Valency: number of arcs connected to a node?

3 differences:

Prim's can be used on a matrix, Kruskal's can't.
Prim's needs a starting vertex whilst Kruskal's starts with the lowest arc.
Prim's grows in a connected fashion, connecting arcs to previously used nodes, whilst Kruskal does not.

would that do you think?

thanks for the reply btw :u: