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

Because once it reaches T, the route has ended, so there's no need to add 2 on to the last arcs of the route. Also, you add 2 to every arc except GT and HT, not only the ones on the shortest route, as you'd have to do it prior to doing dijkstra's algorithm, that's why it's not added to GT and HT and not just one or the other.

How do you find the shortest route in Dijkstra's algorithm without going through a particular arc that would be included in the shortest route ? Like in question 6(c):
https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/June%202011%20QP%20-%20D1%20Edexcel.pdf

I don't think there's any particular method unfortunately, I think you just have to keep trial and erroring to see which route is the shortest :/

When you draw an precedencd table and the graph, how do you deduce the critical activities?

Also does anyone know please whether questions like 8d and 8e https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/January%202004%20QP%20-%20D1%20Edexcel.pdf are in the spec, not seen questions like them before, thanks

Is the any difference between the IAL spec and the UK spec?


Posted from TSR Mobile

The spec changed back in 2009 so any past papers before that may have some stuff not in the spec.However question 8d and 8e look okay to do

Please could anyone explain question 6d here https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/January%202015%20(IAL)%20QP%20-%20D1%20Edexcel.pdf how do you know what objective line equation to use since the objective line I drew didn't lead to the correct answer, thanks

What the?!

Can someone please confirm that Ex 5A question 4 (Chapter 5 - Critical Path Analysis) shows the same activity network in their D1 edexcel textbook as is on the solutionbank here?
https://86495a24d9b181f09087f4168bceb629c30e8d9b.googledrive.com/host/0B1ZiqBksUHNYYzJJZms0aVJZTW8/CH5.pdf
My textbook has a completely different arrangement of letters I,K,J and L.

Thanks!

For question 2(a) of the June 2010 paper, why did they reject arc BD?


Paper: https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/June%202010%20QP%20-%20D1%20Edexcel.pdf

MS: https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/June%202010%20MS%20-%20D1%20Edexcel.pdf

They didn't, it's just written under CE, to show that it has the same weight, so it doesn't matter what order it's written in, 'NOT CE' is just referring to the arc CE, but BE is added.

How would you do part (d) question 5 of the January 2006 paper? I would've just guessed through trial and error but there must be a better way right?

Paper: https://d0247e65b1a6ead8e6286cd43803e643462f2b31.googledrive.com/host/0B1ZiqBksUHNYNlBRQkZFLXdQS0E/January%202006%20QP%20-%20D1%20Edexcel.pdf