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Edexcel C2 20th May 2015 *Official Thread*

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Avatar for a.a.k
a.a.k
2
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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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
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
Original post by BBeyond
hahaha some poor efforts all round :wink:


you ready for chem lol?
Original post by BBeyond
hahaha some poor efforts all round :wink:


I admit that. :colonhash:
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).
Can someone write down all the questions exactly so I can have a go at them please?
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 :smile:
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 :smile:
Original post by frozo123
you ready for chem lol?


born ready pal you?

Original post by enaayrah
I admit that. :colonhash:


wasn't even aimed at u tbh aha but i just read your post and now it is :wink:
Can someone write down all of the questions exactly so I can have a go at them please?
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 :smile:
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 :tongue:

Good luck for tomorrow :smile:
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 :wink:


cba man hate unit 1
ImageUploadedByStudent Room1432071989.859137.jpg

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


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Reply 1575
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a.a.k
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Original post by enaayrah
I just thought I'd end all this trolling and crappy banter once and for all :tongue:

Good luck for tomorrow :smile:


Bad banter is good
So good luck then

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Gunna need some pre workout in the morning given I go sleep at 1 lawl
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 :wink:


:ashamed:

Good luck for tomorrow
Well, good luck and goodnight!

I shall see you on the other side
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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