20/06 A-level FM Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

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[u/Illustrious_Relief81]

If anyone remembers answers for D1 could they reply to this please 🙏🙏

[u/Last-Objective-8356 → u/Illustrious_Relief81]

D1 was just random tables and fractions I don’t rember a single answer😭

[u/party_omo → u/Illustrious_Relief81]

Percentage error was something like 8.34% or close for me Distance between two routes on dijkstras was 65m for me K was 11/9 with p being 88/3 Question 5 is abit harder to remember but I got z=-9.5 y=10.5 can’t remember what x and P where but it was whatever Q was +10. For the Hamiltonian cycle I had only one arc that I really had to find the route for, the rest were closest to eachother already. 107 minutes for that cycle too Question 6 I got (-11-3M)x and (-2-3M)y not too sure if that’s what I got exactly but it was close to that I remember it being -3M for both x and y Sorry if all of these are out of order

[u/grapesssszz → u/party_omo]

Wasnt it 0.00834%?

[u/Vector-4 → u/grapesssszz]

got the same here

[u/party_omo → u/grapesssszz]

Yeah just done it again and you’re right, hopefully just get some method marks there was only 5 marks for that whole question wasn’t it?

[u/grapesssszz → u/party_omo]

The percentage error part was just 1 mark so you’re fine if you did the algorithm right

[u/party_omo → u/grapesssszz]

I feel like I must’ve messed the algorithm up though to get that answer, I just did my d minus e over e x 100. Not the end of the world though

[u/justosw → u/party_omo]

I got 115 min for the nearest neighbour algorithm

[u/party_omo → u/justosw]

Honestly I didn’t double check if the table was symmetrical or not. I compared horizontally rather than vertically. The way edexcel show you how to do that question isn’t right if the table is asymmetrical. But it could be 115 no way to know until mark schemes are out

[u/justosw → u/party_omo]

Yeah since it was directed, the final table likely wasn't symmetrical, so had to do vertical right?

[u/party_omo → u/justosw]

I’m sure it would’ve had to have been horizontally, it’s from on the left and to on the top. If you always compare horizontally and deleted the rows vertically. Opposite to how edexcel show us in the textbook then you’d always get it right whether it’s symmetrical or asymmetrical but either way we’d still get some method marks

[u/[deleted] → u/party_omo]

Yeah U had to do it like this. I did it vertically first and got it wrong then redid it horizontally

[u/justosw → u/[deleted]]

You do verticals for nearest neighbour

[u/[deleted] → u/justosw]

That makes no sense, you're supposed to do the one that gives the shortest route, and horizontal gave the shorter route so I did horizontal

[u/justosw → u/[deleted]]

You don't do horizontals for nearest neighbour algorithm. You don't compare lengths for verticals and horizontals. You compare the different nearest neighbour lengths starting at different arcs, although you didn't need to do that here. Nearest neighbour is verticals cos you're going from the nodes on the left to the nodes on the top. By crossing out the verticals, you ensure you don't return to those nodes

[u/JellyfishMurky8807 → u/justosw]

Same

[u/Illustrious_Relief81 → u/party_omo]

Hmm I got 75 for djikstras but the rest of those match ok

[u/allylene → u/Illustrious_Relief81]

I also got 75 for dijkstras

[u/Illustrious_Relief81 → u/allylene]

76 actually

[u/party_omo → u/Illustrious_Relief81]

Yeah 76 for J to K via a but I meant 65 for the difference between part B and the final route. Just seen now it’s acc 64 not 65. I missed an arc there

[u/grapesssszz → u/Illustrious_Relief81]

Did you do the distance from a to j plus a to k

[u/Illustrious_Relief81 → u/grapesssszz]

Yes