Edexcel A-level Further Decision 2 - 25th June 2019 [Exam Discussion]

Original post by l_bland3

My teacher told my class that only 21 people are taking it this year- 4 from my school

Interesting. I know I was the only one in my school taking it. The rest have done FM1 and D1

Reply 23

That's so few wow! 4 from my school as well

Original post by l_bland3

My teacher told my class that only 21 people are taking it this year- 4 from my school

Reply 24

Original post by Schnoop

Gonna post the answers I stored in my calculator:

1. Transportation cost was 1086

2. Hungarian algorithm max. profit was 559

3. Route was SBFJT and 0=< x < 54

4. Game Theory - V constraints were wrong way round, didn't make matrix non negative (also I don't know if V>=0 is necessarily true but idk)
Value of game to A was 4.6?

5. Flow question? Cant remember much

6. Un = 4n - 2/3 + 8/3 (-0.5)^n
Un --> 4n as n gets large

7. She should not play the game originally
A was 5, B was 108, C was 3
Minimum prize was £66.18

Damnnn I'm such an idiot on the recurrence relations one. I worked it all out but forgot it was 4n - I just wrote 4 and forgot the n. Oh well

Reply 25

Anyone remember the number of marks for the reccurance relations question?

Reply 26

2, 6 and 2 for each part?

Maybe not too sure

Original post by james_ball

Anyone remember the number of marks for the reccurance relations question?

Reply 27

11 overall. 2 for showing what it was, 7 for solving and 2 for guessing what k was as n = infinity. I'm just confused on how they've got -2/3 and 8/3, because I definitely didn't.

Original post by james_ball

Anyone remember the number of marks for the reccurance relations question?

Reply 28

Original post by Memecon

11 overall. 2 for showing what it was, 7 for solving and 2 for guessing what k was as n = infinity. I'm just confused on how they've got -2/3 and 8/3, because I definitely didn't.

Yeah neither did I. I think the answer should be Un = 2 + 4n + 8(-1/2)^n

Reply 29

That's what I got too. Everything else looks right too me though. Can't remember what I got for the transportation problem though. I remember my solution for c wasn't optimal.

Original post by james_ball

Yeah neither did I. I think the answer should be Un = 2 + 4n + 8(-1/2)^n

How did it go today guys?

Reply 31

Original post by Evil Homer

How did it go today guys?

Good! Harder than expected though and lost more marks than I wanted but should be on track for an A* still.

Reply 32

Could be better since I think question 7 and the last part of 4 I know I messed up on. Everything else I feel should be fine

Original post by Evil Homer

How did it go today guys?

Reply 33

What was U2? Was it 8 or 12

Original post by Memecon

That's what I got too. Everything else looks right too me though. Can't remember what I got for the transportation problem though. I remember my solution for c wasn't optimal.

Reply 34

u2 was 8 and u1 was 2

Original post by Schnoop

What was U2? Was it 8 or 12

Reply 35

Then the other answer above doesn't work does it? That's gives U2 as 12

Original post by Memecon

u2 was 8 and u1 was 2

(edited 4 years ago)

Reply 36

I think it works, since B = -2 so -2 x 1 = -2. A = 8 so 8 x 0.5 squared = 2. That leaves 4n, where 4 x 2 = 8. -2 + 2 + 8 = 8. But I may be remembering the question wrong.

Original post by Schnoop

Then the other answer above doesn't work does it? That's gives U2 as 12

Reply 37

Peekay2001

1

I also got Un = 4n - 2/3 + (8/3 * (-0.5)^n)

Reply 38

l_bland3

3

I did the same, that’s so annoying

Original post by james_ball

Damnnn I'm such an idiot on the recurrence relations one. I worked it all out but forgot it was 4n - I just wrote 4 and forgot the n. Oh well

Reply 39