How was thhe C1 exam? Watch

Poll: How was the C1 exam?
Awesome (22)
45.83%
It was alright (21)
43.75%
Disastor (5)
10.42%
unknownz
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#1
Report Thread starter 12 years ago
#1
Hi

I am studying GCSE, but gave C1 early. It was really easy test, apart from one question, which was simple, but i am kind of sure that i got it wrong.

The question was find u1, u2, u3...

u(1) = 3

(mean below u)

u(n+1)=3*u(n)-5

second part:

Sigma (top part = 5) (below it said r=1) a(r)

What were your answers to these parts, if anyone can remember.

Best of luck for rest of the exams. I have got GCSE english lit tomorow.

Thanks
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SunGod87
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#2
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#2
Well you have u(1) = 3
Plug this into the equation
u(n + 1) = 3*u(n) - 5
So therefore u(2) = (3*3) - 5 = 4
And u(3) = (3*4) - 5 = 7
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getphighted
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#3
Report 12 years ago
#3
a) U1 = 3
U2 = 4
U3 = 7

b) U4 = 16
u5 = 43

so Sn = 3 + 4 + 7 + 16 + 43
= 73
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unknownz
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#4
Report Thread starter 12 years ago
#4
I got the first part right but i have messed up on the second one. Anyway it was only 3 marks, considering i got most of other questions correct. By the way was it a AP or GP?

thanks
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getphighted
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#5
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#5
it was neither, i dont think, thats the tricky part, on last years paper or the one before that, there was a question were all the odd terms were 1 and all the even terms were 4, theyre nasty like that
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jason01
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#6
Report 12 years ago
#6
u involves A.P and ar involves G.P
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unknownz
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#7
Report Thread starter 12 years ago
#7
(Original post by getphighted)
it was neither, i dont think, thats the tricky part, on last years paper or the one before that, there was a question were all the odd terms were 1 and all the even terms were 4, theyre nasty like that

I remember doing that one while i was solving past papers, but it was easy when compared to this one. But if this one has GP, they will have to give us extra marks, or balance some how because we dont learn GP for Edxcel C1
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getphighted
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#8
Report 12 years ago
#8
no it wasnt either, if you try and work out a value of r using ar^2 / ar you get 1.75, and if you do ar^3 / ar^2 you get 2. 857, as r is not the same, you know that there is not common ration. so it is not a GP and it doesnt have a common difference either so it isnt an AP, its just some nasty little progression they thought up, they wont ive extra marks as your expected to notice it isnt an AP i expect.
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unknownz
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#9
Report Thread starter 12 years ago
#9
oh well. no probs, i hope i have got everything else right
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getphighted
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#10
Report 12 years ago
#10
i got most of it right, but theres always going to be the odd thing you get wrong. you can only hope for the best, post your results up here when you get them and good luck with the GCSE's
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unknownz
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#11
Report Thread starter 12 years ago
#11
thanks
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ma3eeni
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#12
Report 12 years ago
#12
hey all what was the answer to the area question in C1 that of the triangle?
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getphighted
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#13
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#13
i think it was 5/2 root 325 but i dont know
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ma3eeni
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#14
Report 12 years ago
#14
(Original post by getphighted)
i think it was 5/2 root 325 but i dont know
yeah thats wut i got ... but are you sure cuz my friends all got a totally different answer ..
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unknownz
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#15
Report Thread starter 12 years ago
#15
I had root 125*root 65*1/2

to be honest doesnt sound correct to me.
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ma3eeni
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#16
Report 12 years ago
#16
(Original post by unknownz)
I had root 125*root 65*1/2

to be honest doesnt sound correct to me.
nooo thats what i got .. hehe
dont worry
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ma3eeni
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#17
Report 12 years ago
#17
what was the answer to the simioultaneous equation?
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unknownz
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#18
Report Thread starter 12 years ago
#18
lol, fingers crossed on that last question

I always get simultaneous equations correct, cant remember the answer at the moment.
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ma3eeni
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#19
Report 12 years ago
#19
hehe i just saw that i had the spelling wrong .. lol ..
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unknownz
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#20
Report Thread starter 12 years ago
#20
lol, anyway to that root quesiton i have calculated the answer to 45.xx
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