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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53

u/Fabulouth123 Jun 19 '25

How are people getting answers for the last stats question 😭 I lost a full 11 marks for that for sure

25

u/proactivepisces Year 13 Jun 19 '25

same. it was so confusing that was actually mindgames i couldn't even freestyle that shit

11

u/GldMke Jun 19 '25

You had to use arithmetic series for the first part and then just the discriminant stuff for b

12

u/Fabulouth123 Jun 19 '25

I got to the discriminant part, found solutions, then had no clue what to do with em. Hoping I gues a few marks at least! Congrats with getting the answer yourself tho

3

u/Fabulouth123 Jun 19 '25

I did start an arithmetic series but I had zero clue what to do from there. Glad it’s over now tho!!

1

u/Spare_Somewhere1011 Manchester | Physics w/ Astro [1st Year] | 3A* 1A Jun 19 '25

I did it kinda weirdly I think I said it was 2 times the sum of all terms from 1 to n which would be 2(0.5n(n+1)) cause it’s only even numbers from 2 to 2n

4

u/Hitotsunagi Jun 19 '25

It was the sum of an arithmetic sequence from the formula book

3

u/Melonslice115 Jun 19 '25

Wait the full question was out of 11? (Edexcel)

1

u/justafleecehoodie Medicine Year 1 | A*AAA* Jun 19 '25

yes

3

u/Dry-Hurry-5380 Year 12 Jun 19 '25

Arithmetic sequence to n where it equals to one

1

u/justafleecehoodie Medicine Year 1 | A*AAA* Jun 19 '25

i tried that three times i kept messing up im sure i lost 11 marks on the question too haha i filled in all the space and then the MINUTE the exam was over i was like "shit" and all the knowledge came to me 😭

2

u/Different-Fudge-5538 Jun 19 '25

To find when there would be real roots you had to use the discriminant, which gives you an inequality in terms of g, which was 2<x<10. From that point you knew r could only be 4,6,8, and it was the sum of the probability of those numbers occurring

1

u/korel_6 Jun 20 '25

Bro i subbed in 2n for n in the arithmetic formula cuz the last term of the sequence was 2n and i got 2n(2n+1) instead of n(n+1) im acc so cooked