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# OCR MEI D1 Monday January 25th watch

1. Anyone want any support?
I'm pretty much fluent in D1 lol, it's my second language

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Or maybe it's my first o.O
2. God that was horrible Simulation question made me want to cry! God damn zero preperation!
3. (Original post by Bennyboy260692)
God that was horrible Simulation question made me want to cry! God damn zero preperation!
I agree, I also found the linear programming question hard. Do you remember what you got the max profit for the flight? Also has anyone told you since how the simulation question was meant to be done?
4. Maximum profit was 120 adults at £100 each, £12000. The LP question was easy...
5. I personally think, questions 3 4 5 and 6 were plainly gifted points. Easiest simulation question i have ever done on an exam paper! (Here is hoping i got it right now! :P) However, question 1 i got severely confused, and got activites ABD as critical, although all my friends only got A and D. Number 2 was by far the wierdest question i have seen on a D1 paper. I managed to prove the 2 colours bit, as thats just writing red and blue on the graph, but i didnt know the reason for part ii, or how to do the beginning. So, very easy, and yet very hard.

1. ABD.
2. As Above.
3. Simple graphs have all vertexs included in the graph, no loops or more than one arc between 2 vertexs?
Not connected as its in 2 separate pieces.
Added 6 arcs to make 2 square shapes with crosses in the middle. One friend put 1, anyone else?
Ermmm, Added 16 arcs for the graph of arcs that aren't shown. Cant remember any other parts to 3.
4. x + y < 120.
x + y > 100.
x < y (all three are meant to be lessthan/greaterthan or equals too. i cba finding the symbol.
I got for my incomes, 12000, 9000, and 7500 i believe, in that order.
5. I can't remember what i got!
6. 0-2 for falling, 3-8 for not falling. ignore 9.
5 days for the first part. 3 days for the other testing.
and i said use a tree with more apples to improve it?

Hope others got something similar!!!
6. Anyone know how many marks the connected graph section was? Just realised I've done the entire thing wrong (I was confusing connected with complete)
7. it was 8 in total, 2, 2, 3, 1

I confused connected with complete so got it all wrong same as you !

The rest of the paper seemed OK though, probably easier than most of the past papers.
8. (Original post by MarkS2)
it was 8 in total, 2, 2, 3, 1

I confused connected with complete so got it all wrong same as you !

The rest of the paper seemed OK though, probably easier than most of the past papers.
Ah ********, there goes any chance of getting >90% in it ...
9. I found questions 2 (algorithms) and 3 (graphs) hardest, but think I got them sorted by the end of the 90 minutes! I was getting loops and cycles muddled up...
10. (Original post by Eyesickle)
I personally think, questions 3 4 5 and 6 were plainly gifted points. Easiest simulation question i have ever done on an exam paper! (Here is hoping i got it right now! :P) However, question 1 i got severely confused, and got activites ABD as critical, although all my friends only got A and D. Number 2 was by far the wierdest question i have seen on a D1 paper. I managed to prove the 2 colours bit, as thats just writing red and blue on the graph, but i didnt know the reason for part ii, or how to do the beginning. So, very easy, and yet very hard.

1. ABD.
2. As Above.
3. Simple graphs have all vertexs included in the graph, no loops or more than one arc between 2 vertexs?
Not connected as its in 2 separate pieces.
Added 6 arcs to make 2 square shapes with crosses in the middle. One friend put 1, anyone else?
Ermmm, Added 16 arcs for the graph of arcs that aren't shown. Cant remember any other parts to 3.
4. x + y < 120.
x + y > 100.
x < y (all three are meant to be lessthan/greaterthan or equals too. i cba finding the symbol.
I got for my incomes, 12000, 9000, and 7500 i believe, in that order.
5. I can't remember what i got!
6. 0-2 for falling, 3-8 for not falling. ignore 9.
5 days for the first part. 3 days for the other testing.
and i said use a tree with more apples to improve it?

Hope others got something similar!!!
I got similar for most of them but messed up the last question big time. I put 0-2 for apples one a two falling, 3-5 for 3-4..... and then 9 reject. Do you think I will get any marks?
11. I got 26 miles for the shortest route on question 5, and 45 miles for the minimum spanning tree.
12. (Original post by Phil_Waite)
I got 26 miles for the shortest route on question 5, and 45 miles for the minimum spanning tree.
That sounds like my answers too.
And then for the using AD (I think it was AD) part my two answers were three and four I think.
13. I found most of it ok, didnt do question 2 though.
14. AH!!! thats what i got confused on.
the last part of question 5 when it was on about shortening AD. i didn't know whether it wanted it to definetley be used, or just whether it COULD BE INCLUDED. therefore, i used values to make it be considered.
e.g. for the second part of it, i made AD the same as the arc AE i think it was, so reduced it to 10, rather than 9.
dont know if that will get me marks, because im sure you can randomly pick them if they are the same lengths?
15. Here's how I thought it went -

Q1 - 100%, pretty easy I thought
Q2 - 7/8 marks, think I got ii wrong.
Q3 - Was this the one with the un-connected graph? I may have got the definitions wrong, or atleast one of them, because I know I drew on the wrong number of arcs. For the last part I got 6+16=22 which I am sure is right.
Q4 - Thought this was ok except I made a silly mistake. I wrote down x<y and yet took my feasable region as x>y. I am under the impression that I would get the marks for my method after that point? Gay if I don't.
Q5 - Can't really remember this question, was it the Djikstra one? Got all of it I think except maybe not the part where you had to show how AD (Or another line I cant remember) would become part of the minimum connector. I got 9 but think this may be wrong...not sure. Got the rest of the question fine. Got 9 for first part aswell which most of my classmates got I think...
Q6 - 100%

Overall I think I dropped 1 mark on Q2, Maximum 4 on Q3, Q4 depends On whether I get method marks, and 1 mark on Q5, so overally I scored hopefully above 62...
16. (Original post by EmperorMustard)
Q3 - For the last part I got 6+16=22 which I am sure is right.
I put 22 at first, but decided it wasn't counting the original 6 because it was drawing a completely new graph. (So I put 16)

(Original post by Eyesickle)
the last part of question 5 when it was on about shortening AD. i didn't know whether it wanted it to definetley be used, or just whether it COULD BE INCLUDED. therefore, i used values to make it be considered.
I went for definitely using it, maybe they'll give it whichever you did?
17. (Original post by EmperorMustard)
Here's how I thought it went -

Q1 - 100%, pretty easy I thought
Q2 - 7/8 marks, think I got ii wrong.
Q3 - Was this the one with the un-connected graph? I may have got the definitions wrong, or atleast one of them, because I know I drew on the wrong number of arcs. For the last part I got 6+16=22 which I am sure is right.
Q4 - Thought this was ok except I made a silly mistake. I wrote down x<y and yet took my feasable region as x>y. I am under the impression that I would get the marks for my method after that point? Gay if I don't.
Q5 - Can't really remember this question, was it the Djikstra one? Got all of it I think except maybe not the part where you had to show how AD (Or another line I cant remember) would become part of the minimum connector. I got 9 but think this may be wrong...not sure. Got the rest of the question fine. Got 9 for first part aswell which most of my classmates got I think...
Q6 - 100%

Overall I think I dropped 1 mark on Q2, Maximum 4 on Q3, Q4 depends On whether I get method marks, and 1 mark on Q5, so overally I scored hopefully above 62...
Got all of Q2i defo wrong.

2ii, i think it needed a terminating condition.
18. I found it all okay except question 2!!
Can anbody explain how its done because it'll frustrate me forever otherwise!?
19. For question two, you just isolated the "red-blue" nodes.

Then you switched the "red blue" around to "blue red" for each one.

Then you replaced the other two colours (was it orange and yellow or something) with blue and red where they fitted (on the top it ended up with red BLUE red, where blue was a repalcment of orange).

That's all they wanted! It threw me as well for 10 minutes, but once you worked it out they were easy marks!
20. (Original post by Eyesickle)
AH!!! thats what i got confused on.
the last part of question 5 when it was on about shortening AD. i didn't know whether it wanted it to definetley be used, or just whether it COULD BE INCLUDED. therefore, i used values to make it be considered.
e.g. for the second part of it, i made AD the same as the arc AE i think it was, so reduced it to 10, rather than 9.
dont know if that will get me marks, because im sure you can randomly pick them if they are the same lengths?
omg! i did exactly the same.i hate ambigous questions like that.what did you do in question 2?

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