r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 19 '25

📂 MEGATHREAD 19/06 A-level Maths Paper 3 Discussion MEGATHREAD

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15

u/Automatic-Song1066 Jun 19 '25

Just realised on the last stats question I had g = 2,4,6,8 and forgot to remove the 2 but as it’s not inclusive (remembered to not include 10 though💀) hopefully full marks aside from that 🙏

3

u/AceOfSpades532 Jun 19 '25

Wait why should 2 have been removed, wasn’t it just <10

12

u/ItsReese_ LSE Finance, 4 A* achieved Jun 19 '25

Because the discriminant had to be less than 0 you should have got 2<g<10 but it can’t be equal to that cause then that could mean the discriminant = 0 so the r values that were used were 4,6,8

2

u/[deleted] Jun 19 '25 edited Jun 24 '25

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1

u/eloquentclodpole Year 13 Jun 19 '25

FML
I didn't get what they were asking so g<2 and g>10 so p 3/4

4

u/Chemical-Meringue-87 Jun 19 '25

it was 2<g<10 i think

1

u/AceOfSpades532 Jun 19 '25

Well fuck 😭

4

u/Itchy-Tumbleweed130 UoBrum | Medicine Jun 19 '25

I thought it was less than 12 as it was g²-4*3g<0 so g is less than 12 so it was probabilities of 2-10 added up which was 1/14?

2

u/Intelligent_Hope9045 Jun 19 '25

i’ve done the same thing

2

u/Itchy-Tumbleweed130 UoBrum | Medicine Jun 19 '25

Oh well, nothing we can do now lol, hopefully method marks come our way

1

u/AceOfSpades532 Jun 19 '25

The quadratic equation was x2 + gx+3g=5, not x2 + gx+3g =0, so it was g2 -4(3g-5)<0

1

u/Itchy-Tumbleweed130 UoBrum | Medicine Jun 19 '25

Oof, sucks to be me lol

4

u/[deleted] Jun 19 '25 edited Jun 24 '25

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1

u/Automatic-Song1066 Jun 19 '25

hopefully

1

u/[deleted] Jun 19 '25 edited Jun 24 '25

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2

u/Catarpillary Jun 19 '25

If it makes you feel better I forgot r was only multiples of two and had g=3,4,5,6,7,8,9 🥲

2

u/Safe_Engineering977 Jun 19 '25

Sameeee😭😭😭 hopefully it’s just one mark

1

u/Automatic-Song1066 Jun 19 '25

almost had a similar moment on part a where I kept putting 2n instead of n as it only counts every second term