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# AQA Mathematics MD01 Decision 1 – Friday 24th June [Exam Discussion Thread]

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1. (Original post by Zyzz_aesthetic)
I thought i did too but i used my graphics cal to plot the region x>2y which is the right inequality i dont think i got that wrong i am not sure where i messed up shm
I went below, got the right objective line equation and I still got £500 :/
2. (Original post by yelash)
I went below, got the right objective line equation and I still got £500 :/
Yh you do go below, so your right there but i got 500 first then got 505, oh well
3. (Original post by harv221)
which question is this about? pretty sure i did the 10+12 :/
The Chinese postman question which had several variations/parts but only was like 9 marks total.
Pretty sure my answer to a) was right but i wasn't really sure for b) or c)
4. (Original post by Zyzz_aesthetic)
Yh you do go below, so your right there but i got 500 first then got 505, oh well
Well the variation between £500/£505 can be explained by a sight variation in lines because both my values were values which i rounded down. This was necessary as rounding up from e.g. 10.5 is not right as it would be outside the feasible region.

However the general consensus seems to be £520 so I'm not very confident. If it's £505 i should get the marks though due to reading errors and vise versa for you, but i don't it will be either
5. (Original post by yelash)
Well the variation between £500/£505 can be explained by a sight variation in lines because both my values were values which i rounded down. This was necessary as rounding up from e.g. 10.5 is not right as it would be outside the feasible region.

However the general consensus seems to be £520 so I'm not very confident. If it's £505 i should get the marks though due to reading errors and vise versa for you, but i don't it will be either
**** it what can you do right, i mean ppl in my sch got x=18 y=8 whicb is close to 20 and 10 but yh i musy have ****ed up somewhere
6. (Original post by Hjyu1)
Why is kruskals wrong there is not other information to say k between any other boundary
(Original post by sufiyan1999)
Apparently according to people on this its 10 <K<14??
Not sure. But i got the 10
I got x > 10 as well. I'm not sure where the 14 is coming from. If x was greater than 14, there would be no effect on the edges chosen and CD would still be part of the tree.
7. (Original post by sam_97)
I got x > 10 as well. I'm not sure where the 14 is coming from. If x was greater than 14, there would be no effect on the edges chosen and CD would still be part of the tree.
That's what I got have no clue why 14 is put in.
8. (Original post by sufiyan1999)
That's what I got have no clue why 14 is put in.
There's no information to indicate X is less than 14 as if either the 14 edge are X edge are chosen it forms a cycle so yeah I think X>10 is right
9. (Original post by sufiyan1999)
That's what I got have no clue why 14 is put in.
Agreed, x>10
10. (Original post by yelash)
Well the variation between £500/£505 can be explained by a sight variation in lines because both my values were values which i rounded down. This was necessary as rounding up from e.g. 10.5 is not right as it would be outside the feasible region.However the general consensus seems to be £520 so I'm not very confident. If it's £505 i should get the marks though due to reading errors and vise versa for you, but i don't it will be either
(Original post by Zyzz_aesthetic)
**** it what can you do right, i mean ppl in my sch got x=18 y=8 whicb is close to 20 and 10 but yh i musy have ****ed up somewhere
The answer to this question was definitely £520 (x=24, y=8), I checked on Wolfram Alpha.

I ended up with x=21 and y=10 in the exam, which gave a profit of £515. I'm not sure where I went wrong to be honest!
11. (Original post by sam_97)
The answer to this question was definitely £520 (x=24, y=8), I checked on Wolfram Alpha.

I ended up with x=21 and y=10 in the exam, which gave a profit of £515. I'm not sure where I went wrong to be honest!
21 and 10 comes from the wrong region, above x=2y instead of below. Sure it wasn't this? How many marks was it for the maximising profit anyway?
12. (Original post by Hjyu1)
There's no information to indicate X is less than 14 as if either the 14 edge are X edge are chosen it forms a cycle so yeah I think X>10 is right
Those were exactly my thoughts during the exam.
13. (Original post by -jordan-)
21 and 10 comes from the wrong region, above x=2y instead of below. Sure it wasn't this? How many marks was it for the maximising profit anyway?
I'm not too sure what I was thinking to be honest. I think it was 2 marks for finding the values of x and y, and 1 mark for calculating the maximum profit.
14. (Original post by sam_97)
I'm not too sure what I was thinking to be honest. I think it was 2 marks for finding the values of x and y, and 1 mark for calculating the maximum profit.
It's usually only one mark for correct indication of the feasible region, the rest are for the lines. So if it was that then you haven't dropped too many.
15. (Original post by -jordan-)
It's usually only one mark for correct indication of the feasible region, the rest are for the lines. So if it was that then you haven't dropped too many.
I'm sure my feasible region etc was correct, I think I just read off the values wrong. What did you put for the last question on graph theory by the way?
16. (Original post by sam_97)
I'm sure my feasible region etc was correct, I think I just read off the values wrong. What did you put for the last question on graph theory by the way?
If there are 2 vertices with order five (I think it was) then there are two vertices that connect to every other vertex in the network, therefore it's impossible that there's one with an order of one because of the two vertices that connects to all the others. It's a hard one to phrase!
17. (Original post by sam_97)
I'm sure my feasible region etc was correct, I think I just read off the values wrong. What did you put for the last question on graph theory by the way?
I put profit as 520. used 2x=y and 2x+y=720? or something like that....
18. That was an easy paper tbh. I hate tracing algorithms so much and it didnt come up as I mess up on that everytime!!!! So yay for me
19. (Original post by fpmaniac)
That was an easy paper tbh. I hate tracing algorithms so much and it didnt come up as I mess up on that everytime!!!! So yay for me
sames i thought that the paper was fairly easy and i was made up when there was no algorithms
20. The vertex question part ii) was something along these lines where the graph was semi eulerian and had 5 vertices and was a tree

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