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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by enaayrah)
I don't even take further maths haha so....
My maths is quite basic
Its not even further its phd level man. I just know what it is jaut trolling you

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2. i don't get how you do the binomial expansion formula thing with the factorials to solve for n.
like if you had nC2=6, you would put it in to nCr=n!/r!(n-r)! to get that 6=n!/2!(n-2)!
then i just have no clue how to solve for n
3. (Original post by jshep000)
****ing dire mate, really is lmao.
hahahah idk what to say do people genuinely think they're hilarious or what aha
4. (Original post by BBeyond)
hahaha some poor efforts all round
you ready for chem lol?
5. (Original post by BBeyond)
hahaha some poor efforts all round
6. (Original post by johnhick98)
can someone please explain how to distinguish wether the trapezium rule give and underestimate or everestimate
Sketch the graph. Sketch the trapezium. You'll be able to tell if it's an overestimate (the trapezium cover a bigger area than the curve) or an underestimate (the trapezium all lie under the curve).
7. Can someone write down all the questions exactly so I can have a go at them please?
8. (Original post by a.a.k)
If you dont go to sleep from this point you most likely to struggle tommorrow so good night

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godnight
9. (Original post by johnhick98)
can someone please explain how to distinguish wether the trapezium rule give and underestimate or everestimate
Literally just watched this video now! https://www.youtube.com/watch?v=JA_ZAk_rOLw

Hope this helps
10. (Original post by frozo123)
you ready for chem lol?
born ready pal you?

(Original post by enaayrah)
wasn't even aimed at u tbh aha but i just read your post and now it is
11. Can someone write down all of the questions exactly so I can have a go at them please?
12. (Original post by Abbey.)
i don't get how you do the binomial expansion formula thing with the factorials to solve for n.
like if you had nC2=6, you would put it in to nCr=n!/r!(n-r)! to get that 6=n!/2!(n-2)!
then i just have no clue how to solve for n
you mean if I had (3x+6)^n
and they asked me what n is?
do you know how to use the (1+nx) thing? if you don't let me know I'll help you
13. (Original post by a.a.k)
Its not even further its phd level man. I just know what it is jaut trolling you

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I just thought I'd end all this trolling and crappy banter once and for all

Good luck for tomorrow
14. (Original post by BBeyond)
born ready pal you?

wasn't even aimed at u tbh aha but i just read your post and now it is
cba man hate unit 1

15. Guys please please please PLEASE. Help me with this. Last thing before I hit the hay

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16. (Original post by enaayrah)
I just thought I'd end all this trolling and crappy banter once and for all

Good luck for tomorrow
Bad banter is good
So good luck then

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17. Gunna need some pre workout in the morning given I go sleep at 1 lawl
18. (Original post by BBeyond)
born ready pal you?

wasn't even aimed at u tbh aha but i just read your post and now it is

Good luck for tomorrow
19. Well, good luck and goodnight!

I shall see you on the other side
20. (Original post by Abbey.)
i don't get how you do the binomial expansion formula thing with the factorials to solve for n.
like if you had nC2=6, you would put it in to nCr=n!/r!(n-r)! to get that 6=n!/2!(n-2)!
then i just have no clue how to solve for n
n! = n x (n-1) x (n-2) x ... x 2 x 1
(n-r)! = (n-r) x ... x 2 x 1 etc.

so most of the n! cancels out when you divide.
ie. for nC2 = 6 you have n!/2!(n-2)! which simplifies to n(n-1)/2

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