Edexcel A2 D2 Mathematics June 2016 - Official Thread

If you have a degenerate solution, do you have to fill a 0 into one of the cells before beginning the stepping-stone method? And if so, which cell do you choose? I know it makes no impact on initial cost, but surely it would make a difference when you're working out the improvement indices?

Yes, you do.

You can choose any cell. However it's usually best to put it next to other values in the table, so you can keep the "movement" one square down, across, etc. when doing stepping stone

Reply 181

fpmaniac

2

By inspection, find a flow-augmenting route to increase the flow by one unit. You must stateyour route

How would you go about doing this?????

Reply 182

4nonymous

11

Original post by fpmaniac

By inspection, find a flow-augmenting route to increase the flow by one unit. You must stateyour route

How would you go about doing this?????

What Question is it?

Reply 183

AlmostNotable

12

Original post by physicsmaths

Duno lol.

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Finished learning it?

Reply 184

username1162972

18

Original post by AlmostNotable

Finished learning it?

Lol no. Done like 3/4 chapters haha
Game theory was rather fun.

Posted from TSR Mobile

Reply 185

AlmostNotable

12

Original post by physicsmaths

Lol no. Done like 3/4 chapters haha
Game theory was rather fun.

Posted from TSR Mobile

I have done 5 chapters. They are all pretty so far. Only need 70 for A* in Additional further maths.

Reply 186

username1162972

18

Original post by AlmostNotable

I have done 5 chapters. They are all pretty so far. Only need 70 for A* in Additional further maths.

Same I need around 60-70 or somenthing.
Game theory is interesting.

Posted from TSR Mobile

Reply 187

AlmostNotable

12

Original post by physicsmaths

Same I need around 60-70 or somenthing.
Game theory is interesting.

Posted from TSR Mobile

Since you have done Game theory. Page 150-151, do you think the optimal solution is wrong? Surely its the top intersection since we are looking for minimax.

Reply 188

yesyesyesno

3

Why is it that in the mark scheme for flow augmenting routes, they went against the direction arrow and also went into a saturated arc? I thought you can't do that when finding flow augmenting routes. :s-smilie:

Reply 189

M.green

Can some one please explain
How do you know the dp question in 2015 paper was a mini max?

Reply 190

oinkk

3

Original post by M.green

Can some one please explain
How do you know the dp question in 2015 paper was a mini max?

It was a maximin. "Maximum of the minimums". Janet wanted to find the maximum weight of the truck she could use, given a set of maximum weights on the roads.

This is where you have to be careful. The 'maximum weights on the roads' refers to the smallest values in the network.

Hence, maximum of the minimums. Maximin.

Reply 191

ISAAQAHELP

2

how do you do june 2015 q4c flow question?
plz someone reply asap

i got it

Really hope dynamic programming is a graph and not a manufacturing mind****

Reply 194

DORI

1

Hi
could some please explain why row 4 dominates row 2 in this question.
I thought it was the other way round......
question 4
qp: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20QP%20-%20D2%20Edexcel.pdf
ms: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20MS%20-%20D2%20Edexcel.pdf

thanks and good luck to all
:yy:

Reply 195

KloppOClock

14

Original post by DORI

Hi
could some please explain why row 4 dominates row 2 in this question.
I thought it was the other way round......
question 4
qp: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20QP%20-%20D2%20Edexcel.pdf
ms: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20MS%20-%20D2%20Edexcel.pdf

thanks and good luck to all
:yy:

your looking at columns not rows. when looking at columns, your are looking at the points gained by player b. however, this is a table by player a.

When looking at columns, if a<b a dominates b

When looking at rows, if a>b a dominates b

Reply 196

AlmostNotable

12

Original post by DORI

Hi
could some please explain why row 4 dominates row 2 in this question.
I thought it was the other way round......
question 4
qp: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20QP%20-%20D2%20Edexcel.pdf
ms: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20MS%20-%20D2%20Edexcel.pdf

thanks and good luck to all
:yy:

B is the defensive player. Why would he play 4 when 2 has lower losses?

Reply 197

username2638907

13

Original post by DORI

Hi
could some please explain why row 4 dominates row 2 in this question.
I thought it was the other way round......
question 4
qp: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20QP%20-%20D2%20Edexcel.pdf
ms: https://3cb8366df74746bcd8eec8f4a7035f5f8ad90c26.googledrive.com/host/0B1ZiqBksUHNYRDVfakk5MURORVE/June%202014%20MS%20-%20D2%20Edexcel.pdf

thanks and good luck to all
:yy:

You mean column 4 and column 3 right?

Since you're looking at columns then you're reading the table as if you were B. e.g, every negative number in the table is actually a gain for B (because the table is written from A's point of view). Hence, column 4 dominates column 2.

Reply 198

DORI

1

Original post by AlmostNotable

B is the defensive player. Why would he play 4 when 2 has lower losses?

thats what i thought but apparently its not like that......
he would rather play 4 than play 2

Reply 199

DORI

1

Original post by KloppOClock

your looking at columns not rows. when looking at columns, your are looking at the points gained by player b. however, this is a table by player a.

When looking at columns, if a<b a dominates b

When looking at rows, if a>b a dominates b

yh sorry meant columns

thanks that makes sense :smile:

Edexcel A2 D2 Mathematics June 2016 - Official Thread

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