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Arsey's S15 D1 Model Answers

edit - look for the other thread
(edited 8 years ago)

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Arsey you da man
Nonetheless, this has settled my dilemma of whether to call this exam extremely difficult, or diabolical.
Reply 3
Avatar for geetu123
geetu123
1
Thanks Arsey! Any idea on the bounadries????
Reply 4
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geetu123
1
I think your integer solution is wrong since it is a strict inequality ..... shouldn't it be (7,7)???
Reply 5
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LouN1997
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question 6 on the integer solutions, since its x<8 and its a strict inequality, it cannot equal 8?
Reply 6
Avatar for 11234
11234
8
I thought for dijkstra's that it was 26 . Can you not repeat vertices??!
Original post by Arsey
A couple of nasty ones I thought

by the way I've not checked them


for 5diii could we have used >= instead of >????
Reply 8
Avatar for 96wst
96wst
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Original post by Arsey
A couple of nasty ones I thought

by the way I've not checked them


I think 6e is wrong. You have x=8 for the optimum integer solution.
x<8 is one of the inequalities, so x can't =8
Original post by 11234
I thought for dijkstra's that it was 26 . Can you not repeat vertices??!


I thought by definition you cannot
Reply 10
Avatar for 96wst
96wst
1
Original post by geetu123
I think your integer solution is wrong since it is a strict inequality ..... shouldn't it be (7,7)???


That is what i got... few!
Yes, why doesn't the second Dijkstra's go through H?
Original post by Arsey
A couple of nasty ones I thought

by the way I've not checked them


what are your grade boundary predictions?

can you suggest a a year for us to be comparing with?
Original post by Mutleybm1996
I thought by definition you cannot


It says route not path though..
thanks soooooo much Arsey
we appreciate everything you do :-D
Original post by sweeneyrod
Yes, why doesn't the second Dijkstra's go through H?


Yes through H would be 8 extra, straight to J would be 9 so it should be through H?
Original post by 11234
I thought for dijkstra's that it was 26 . Can you not repeat vertices??!


I thought it was 26 too
I just realised that on question 3 I did the route between A to H rather than J! i got all the graph right but clearly my final answer and therefore b will be wrong! do they take that into consideration for b does anyone think or have i just dropped all 8 marks?!
Isnt the late event time for the event that is 'connected to' B meant to be 13?
I think you got the last one wrong because B isn't a critical activity whereas C is?

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