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Desicion maths d1 - january 2011 paper question 4c has a mistake?!

Our teacher gave us a breakdown of which questions we got wrong and which questions we got right and everyone got Q4C wrong.
At first i thought it was just crappy teaching or lack of revision but i attempted the question again (for revision because im re-sitting) and got it wrong again, so checked the mark scheme online.

Heres where i got the mark scheme from;
http://www.mystudytable.com/post13968.html

The MS says;
C]e.g.
D – 2 = A – 6 = B – 1 = K – 4 M1
Change status D = 2 – A = 6 – B = 1 – K = 4 A1
A = 6 B = 1 D = 2 J = 3 K = 4 M = 5

notes;

1M1: Path from D to 4 or 1 (or vice versa)
1A1: CAO including change status (stated or shown),but only penalise once per
question, chosen path clear.
2A1: CAO must ft from stated paths, diagram ok. Must have both M’s.

But when i look at the question, A is not connected to 6 at all - not in the bipartite or in the improved matching :/

i just keep on getting a cycle of; D=5-M=2-A=5 AND D=2-A=5-M=2

Sorry for the long winded explanation, any ideas? have i got it wrong??

I'LL THUMBS UP THE FIRST WHO REPIES :biggrin:

Thanks

(edited 13 years ago)

Reply 1

Jampolo

cant check the mark scheme, i have to be a member of the site :frown:

I'd love to see this... got 76 in D1 -.- re-sitting it, but i'd like to see where i went wrong in the 2011 jan exam! (If i rememer my answers :') )

Reply 2

sofiasofia

Original post by Jampolo

cant check the mark scheme, i have to be a member of the site :frown:

I'd love to see this... got 76 in D1 -.- re-sitting it, but i'd like to see where i went wrong in the 2011 jan exam! (If i rememer my answers :') )

I got 60/75 and got a B :/

Sign up to see it :wink:

its worth it! the password is "mystudytable" to view it
Or i could send it to you on an attachment?
Just message me you email :biggrin:

(edited 13 years ago)

Reply 3

Tom1993

I hope it's wrong, I only dropped two marks. :biggrin:

Then again, it can't be at girl at my school got 100% -_-

Reply 4

sofiasofia

Original post by Tom1993

I hope it's wrong, I only dropped two marks. :biggrin:

Then again, it can't be at girl at my school got 100% -_-

damb it :/ i think i need to see where i went wrong. i got 80% and got a B. *dies*
i'll ask my teacher when we get back :smile:

Reply 5

charllysaur

Original post by Tom1993

I hope it's wrong, I only dropped two marks. :biggrin:

Then again, it can't be at girl at my school got 100% -_-

Original post by sofiasofia

damb it :/ i think i need to see where i went wrong. i got 80% and got a B. *dies*
i'll ask my teacher when we get back :smile:

It could still be wrong, 100% UMS marks doesn't mean 100% raw mark, she could have just got everything else right and been really lucky to get 100 UMS.
I haven't looked at the question though so I don't know ^^;

Reply 6

Ben121

I think I remember that question from the exam and thinking it doesn't seem right.

Reply 7

Tom1993

Original post by charllysaur

No, she didn't drop a mark. =/

Reply 8

charllysaur

Original post by Tom1993

No, she didn't drop a mark. =/

It could always be that she did the question on the paper wrong, but out of pure luck she got the right answer because the question was wrong? Far-fetched I know but it could have happened :P

Reply 9

Tom1993

Original post by charllysaur

It could always be that she did the question on the paper wrong, but out of pure luck she got the right answer because the question was wrong? Far-fetched I know but it could have happened :P

Fair point... :P

Reply 10

User12399

Original post by sofiasofia

Thanks

I need help on this. I've just attempted this and can't figure it out.

What answer have you got for part b and c?

Thanks in advance.

Reply 11

sohail.s

in the question it does say "Anthony now agrees to add task 6 to his possible allocations."

which means that A can do either 2,5,6

All you do is start from your matching found in B and proceed as normal, ie find an alternating path...