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

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does the objective function have to be integers because I got x+1.5y but apparently it should be 2x+3y. Also I got 75 for the first part and 35 for the second part of the route inspection.

Reply 1021

I NEED HELP!!!!

Does anyone know how many marks each question was worth? Plz reply

Reply 1022

NotNotBatman

Original post by igotohaggerston

does the objective function have to be integers because I got x+1.5y but apparently it should be 2x+3y. Also I got 75 for the first part and 35 for the second part of the route inspection.

That should be fine as it has the same gradient.

Reply 1023

vishva97

no it didnt specify about being integers

Reply 1024

Historygcse

Explain why should start at an odd node

Reply 1025

Waffles15

Original post by thelegend99

w was 11 cause the float was 1?

yeah it was something like 17-5-w=1 so w=11

Reply 1026

igotohaggerston

Original post by Historygcse

Explain why should start at an odd node

Because in a semi-Eulerian graph if you start at an odd node you will finish at another odd node

Reply 1027

Mia66

Original post by Historygcse

Explain why should start at an odd node

I wrote it should start at an odd node so it could end at another odd node so only one route have to be repeated

Reply 1028

vishva97

Original post by mathsmann

what were your values for w,x,y,z i got 12 for w :s-smilie:

,how many marks would i get for the gantt chart if w is wrong? and anyone know what marks were for each part of question 7 ??

Thats exactly what i did

Reply 1029

Pablo Picasso

Original post by NotNotBatman

That should be fine as it has the same gradient.

Original post by Historygcse

Explain why should start at an odd node

I said about it being semi eulerian if the end node is also odd. Would i get the mark?

Reply 1030

economicss

What are people thinking for grade boundaries? Higher than last year?

Reply 1031

Historygcse

Original post by Mia66

I wrote it should start at an odd node so it could end at another odd node so only one route have to be repeated

I wrote something similar, and that any arcs directly connected to the start and end odd nodes wont have to be repeated? Is that also correct?

Reply 1032

Raaaas

would you get it wrong if you wrote 2x +3y? and what was the answer to the very last question

Reply 1033

Historygcse

Original post by Pablo Picasso

I said about it being semi eulerian if the end node is also odd. Would i get the mark?

not 100% sure , how many marks was the question?

Reply 1034

Mia66

Original post by Historygcse

I wrote something similar, and that any arcs directly connected to the start and end odd nodes wont have to be repeated? Is that also correct?

I don't quite know what you mean but I guess so

Reply 1035

Historygcse

Can anyone remember the chosen arcs for prims

Reply 1036

chloeabeki

Original post by economicss

What are people thinking for grade boundaries? Higher than last year?

I think they'll be pretty much identical, or maybe even 1/2 marks lower.

Reply 1037

Seth17

Original post by Historygcse

Explain why should start at an odd node

A very similar question came up in the June 2014 R paper (feel free check it later if you want to)

The mark scheme says:

"If we start at an odd vertex we will finish at another odd vertex. This removes the need to repeat the route between them. So we just have toconsider one repeated route rather than two."