Edexcel D1 Jan 23 2013 Revision thread

When creating a scheduling diagram, is there a specific way you're meant to do it to get the marks? Or just arrange them in the way that's the best fit for each worker?

The answer is in the question. What is the objective of the linear problem? does it say that they are trying to maximise profit etc? If so optimal value will be maximum.
Post question and we can help further

Yeah I have which page?
Also can someone tell me if its okay for me to use pencil to draw the scheduling/gannt chart diagram. I mean, what questions can use pencil, as I assume all other working out has to be in pen.

Sorry I'm an inependent student so I tend to question everything...
Really appreciating all the help guys - you're ace!

Yeah I have which page?
Also can someone tell me if its okay for me to use pencil to draw the scheduling/gannt chart diagram. I mean, what questions can use pencil, as I assume all other working out has to be in pen.

This may be an incredibly stupid question, but when adding arcs using Kruskal's algorithm or Prim's algorithm does it matter on the order of the letters i.e. when adding the edge between vertex C and vertex D does it matter if you write DC instead of CD or vice versa.

I always assumed that all the drawing stuff had to be done in pencil...

You're right, they don't mention if it is minimum or maximum. Firstly its nothing to worry about as all past papers make clear if they're looking for optimal minimum or optimal maximum. In this case I would assume optimal to be maximum as they have given you a new objective line 'x+2y' and to find optimal generally means to find best/highest value to get best/highest result.

As far as I know you can list the edges in any order. I would normally go for alphabetical as that is how most/all mar schemes list them.

How is everyone feeling?

Most questions in D1 involve drawing of some kind, though!

How is everyone feeling?

I know Never seen a maths module involve so much drawing before.



Earlier today I was pretty confident, but now I am starting to feel worried due to constant silly mistakes. I just want to get the exam over and done with.

I'm feeling okay but I keep making silly mistakes too. Hoping for 100% focus in exam as can't afford to lose silly marks.
Anyone fancy answering a question about a past paper - its the only question I can't get. I mean I don't even understand what its asking. EEK!
I didn't understand f of 17 either, e was pretty straight forward though

Sure I'll give it a go, which one is it?