# Edexcel Maths D1 Watch

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did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

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#2

(Original post by

did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

**SasunD**)did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

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#3

**SasunD**)

did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

Just that on my syllabus i do Pure modules and mechanics modules in order to get my A-Level in Mathematics.

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D1 is Decision Mathematics although on Edexcel's website it is stated as Discrete Mathematics

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#5

(Original post by

Can i just ask what D1 is?

Just that on my syllabus i do Pure modules and mechanics modules in order to get my A-Level in Mathematics.

**bono**)Can i just ask what D1 is?

Just that on my syllabus i do Pure modules and mechanics modules in order to get my A-Level in Mathematics.

On the OCR (MEI) syllabus it deals with things like heuristic algorithms, sorting algorithms, critical path analysis, linear programming, graph theory, simulations and networks.

Traditionally it's supposed to be an easy module, do it if you have the opportunity.

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#6

**SasunD**)

did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

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#7

Yeah i found it really hard too. Much harder than any past papers I had done. Messed up the whole graph question. Will probs resit in June too.

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#9

I found it hard to,eg.definition of matchings!!!

and has anyone got any thoughts on the last question,what is the new time of finishing the projects?I got 22hours also,but my mates got 28 or 30.....

not sure about the flow chart as well!!!

and has anyone got any thoughts on the last question,what is the new time of finishing the projects?I got 22hours also,but my mates got 28 or 30.....

not sure about the flow chart as well!!!

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#10

(Original post by

I found it hard to,eg.definition of matchings!!!

and has anyone got any thoughts on the last question,what is the new time of finishing the projects?I got 22hours also,but my mates got 28 or 30.....

not sure about the flow chart as well!!!

**boss-dior**)I found it hard to,eg.definition of matchings!!!

and has anyone got any thoughts on the last question,what is the new time of finishing the projects?I got 22hours also,but my mates got 28 or 30.....

not sure about the flow chart as well!!!

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#11

I think they try to make D1 papers hard cause the actual course seems easy. I did AQA D1 last summer, my whole class thought the paper was auful but we all got A's (just) so i think its deceptive.

Not like P6 today, which was hell on a paper. literally.

Not like P6 today, which was hell on a paper. literally.

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#12

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Yeah i got 22 too but was in such a rush i didnt even write "hours" - oops.

**p_d33**)Yeah i got 22 too but was in such a rush i didnt even write "hours" - oops.

how about other answers??all I can remember is that,MST is 18 by using both methods ,kruskal's a bit tricky....

the flow charts's output was ended up with 5...

CPA x=0,y=7,z=??forgot...but am sure it is right.

the max flow was26,and should adapt option 2....

.

could anyone think of anything else???tell me if anything above was wrong or differernt from your answer!!!

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#13

(Original post by

that is good,as long as you got 22.....:-)

how about other answers??all I can remember is that,MST is 18 by using both methods ,kruskal's a bit tricky....

the flow charts's output was ended up with 5...

CPA x=0,y=7,z=??forgot...but am sure it is right.

the max flow was26,and should adapt option 2....

.

could anyone think of anything else???tell me if anything above was wrong or differernt from your answer!!!

**boss-dior**)that is good,as long as you got 22.....:-)

how about other answers??all I can remember is that,MST is 18 by using both methods ,kruskal's a bit tricky....

the flow charts's output was ended up with 5...

CPA x=0,y=7,z=??forgot...but am sure it is right.

the max flow was26,and should adapt option 2....

.

could anyone think of anything else???tell me if anything above was wrong or differernt from your answer!!!

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#14

(Original post by

Yeah i got something like that. for the graph q I got P max = 29 and for C min i got 18.91666...

**p_d33**)Yeah i got something like that. for the graph q I got P max = 29 and for C min i got 18.91666...

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#15

I thought that it was a bitunfair really,I think that the exam was far too "wordy" (particularly the 1st question!!!). Here are the bits I can remember...

Was slightly worried about the minimum connector question because I wasn't sure if the edges on the minimum connector could cross-over (my lines crossed but there was no cycle. I think that the edges were selected in a slightly different order dispite the connector being the same...

On the network flow "option 1 VS option 2" question I found tht option 2 was the best because it had a possible gain of 2 rather than a possible gain of 1 by using option 1.

For the linear programming I got a feasible region that was quite small in the centre of the graph. I think that I found the optimal C to be about 36 and I got P to be minimal at 29.5.

In the critical path question I got x=0, y=7 and z=9 (If I remember correctly). For the last C.P.A answer = 22 (I guessed this one because I had no time but a friend says that she got the same...).

Hopefully some peope will have similar answers so I can rest a bit easier knowing that I didn't fail it too badly!!!

Was slightly worried about the minimum connector question because I wasn't sure if the edges on the minimum connector could cross-over (my lines crossed but there was no cycle. I think that the edges were selected in a slightly different order dispite the connector being the same...

On the network flow "option 1 VS option 2" question I found tht option 2 was the best because it had a possible gain of 2 rather than a possible gain of 1 by using option 1.

For the linear programming I got a feasible region that was quite small in the centre of the graph. I think that I found the optimal C to be about 36 and I got P to be minimal at 29.5.

In the critical path question I got x=0, y=7 and z=9 (If I remember correctly). For the last C.P.A answer = 22 (I guessed this one because I had no time but a friend says that she got the same...).

Hopefully some peope will have similar answers so I can rest a bit easier knowing that I didn't fail it too badly!!!

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#16

(Original post by

I thought that it was a bitunfair really,I think that the exam was far too "wordy" (particularly the 1st question!!!). Here are the bits I can remember...

Was slightly worried about the minimum connector question because I wasn't sure if the edges on the minimum connector could cross-over (my lines crossed but there was no cycle. I think that the edges were selected in a slightly different order dispite the connector being the same...

On the network flow "option 1 VS option 2" question I found tht option 2 was the best because it had a possible gain of 2 rather than a possible gain of 1 by using option 1.

For the linear programming I got a feasible region that was quite small in the centre of the graph. I think that I found the optimal C to be about 36 and I got P to be minimal at 29.5.

In the critical path question I got x=0, y=7 and z=9 (If I remember correctly). For the last C.P.A answer = 22 (I guessed this one because I had no time but a friend says that she got the same...).

Hopefully some peope will have similar answers so I can rest a bit easier knowing that I didn't fail it too badly!!!

**Leekey**)I thought that it was a bitunfair really,I think that the exam was far too "wordy" (particularly the 1st question!!!). Here are the bits I can remember...

Was slightly worried about the minimum connector question because I wasn't sure if the edges on the minimum connector could cross-over (my lines crossed but there was no cycle. I think that the edges were selected in a slightly different order dispite the connector being the same...

On the network flow "option 1 VS option 2" question I found tht option 2 was the best because it had a possible gain of 2 rather than a possible gain of 1 by using option 1.

For the linear programming I got a feasible region that was quite small in the centre of the graph. I think that I found the optimal C to be about 36 and I got P to be minimal at 29.5.

In the critical path question I got x=0, y=7 and z=9 (If I remember correctly). For the last C.P.A answer = 22 (I guessed this one because I had no time but a friend says that she got the same...).

Hopefully some peope will have similar answers so I can rest a bit easier knowing that I didn't fail it too badly!!!

I am sure we both did very well,most of your answers are the same as mine ,apart from Min cost Max profit questions.

I am feeling happier after comparing it with you..

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#17

I got z=0 and didnt get the same answers for the linear programming q but frankly everyone ive asked has a different answer!

Other than that i got the same answers.

Other than that i got the same answers.

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#18

**SasunD**)

did anyone do the D1 paper today. personally, i found it hard and think i screwed it up like last time. what do you think?

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#19

(Original post by

I am sure we both did very well,most of your answers are the same as mine ,apart from Min cost Max profit questions.

I am feeling happier after comparing it with you..

**boss-dior**)I am sure we both did very well,most of your answers are the same as mine ,apart from Min cost Max profit questions.

I am feeling happier after comparing it with you..

So you looked at mine and then thought "what an idiot!! at least I beat him"???...hehe

Ohh well, I can always resit....

On the brighter side I only have 2 exam left (although one is the dreaded P2!!!... )

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#20

(Original post by

i am doing it as a further module and it was ****...i prefer P4 and P5 to this rubbish! most of the mocks we did i got over 90%...i think i will get a U in this one though!

**nodabooper**)i am doing it as a further module and it was ****...i prefer P4 and P5 to this rubbish! most of the mocks we did i got over 90%...i think i will get a U in this one though!

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