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Edexcel Mathematics: Core C1 6663 17th May 2017 [Exam Discussion]

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Original post by Sam_99
Could someone clear up for me when doing sequences questions when to use the a + (n-1)d or 1/2[2a+(n-1)d]

What key words do I need to look for so I know which one to use because I'm never completely sure.

Thanks


usually the question will give you a scenario. For example, Sam received £80 for his 10th birthday. Each year from then the amount he receives increases by £10 forming an arithmetic sequence....

a question could ask 'how much does Sam receive on his 19th Birthday?' In this case you'd use a + (n-1)d.

another question could ask 'what is the TOTAL amount of money he receives from his 10th birthday to and including his 21st birthday?' In this case you'd use 1/2[2a + (n-1)d] as you'd need to find the sum of all the money he receives from his 10th birthday to his 21st.

Hope that made things a little clearer
Original post by jayforreal18
WMA01_01_que_20170110.pdfHere's the c12 Jan 2017 paper


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Original post by Fx85GTplus
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WMA01_01_que_20170110.pdf
Any predictions for what's comming up in the C1 paper on Wednesday? And do u think it's good be easy this year or difficult
Reply 124
Avatar for Sam_99
Sam_99
1
Original post by DamnDaniel2
usually the question will give you a scenario. For example, Sam received £80 for his 10th birthday. Each year from then the amount he receives increases by £10 forming an arithmetic sequence....

a question could ask 'how much does Sam receive on his 19th Birthday?' In this case you'd use a + (n-1)d.

another question could ask 'what is the TOTAL amount of money he receives from his 10th birthday to and including his 21st birthday?' In this case you'd use 1/2[2a + (n-1)d] as you'd need to find the sum of all the money he receives from his 10th birthday to his 21st.

Hope that made things a little clearer


Thats great, thank you :h:
Im hoping this year will be good, after all last year's papers are the reasons why I'm resitting :colondollar:
Reply 126
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Qer
16
need help on question 7 part b and c
http://pmt.physicsandmathstutor.com/download/Maths/A-level/C1/Papers-Edexcel-Practice/Practice%20Paper%20A3%20QP%20-%20C1%20Edexcel.pdf
Who's resisting c1 and c2?

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Original post by thehaskone
Any predictions for what's comming up in the C1 paper on Wednesday? And do u think it's good be easy this year or difficult


I haven't seen the proof of arithmetic progression for a while so it wouldn't surprise me if that came up.
My teacher thinks that they might have changed whoever writes the papers, putting more people into designing the new A level papers, so the paper might be like it was last year I.E. WITH NO WHOLE NUMBERS 😥😥😥 so be prepared for that
Original post by cazzers123
I haven't seen the proof of arithmetic progression for a while so it wouldn't surprise me if that came up.
My teacher thinks that they might have changed whoever writes the papers, putting more people into designing the new A level papers, so the paper might be like it was last year I.E. WITH NO WHOLE NUMBERS 😥😥😥 so be prepared for that


I did last years paper for my mock exam and I honestly dont think it was as difficult as everyone says, yes there were a lot of fractions in some questions, but as long as you have decent mental maths skills the paper wasn't to challenging
Reply 130
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candol
7
Original post by Qer


Part b - keep generating the Un terms, - it will become negative in year 6

Part c - let u1 also equal 500000 and sub it in so you get
500,000 = 1.05 * 500000 - d
this gives 500000 = 525000 - d
so d = 25000
Original post by physicsamor
Im hoping this year will be good, after all last year's papers are the reasons why I'm resitting :colondollar:


No same lol, let's hope k doesn't equal 41/8 or R = 44/3 lmao :colondollar:
Reply 132
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Qer
16
Original post by candol
Part b - keep generating the Un terms, - it will become negative in year 6

Part c - let u1 also equal 500000 and sub it in so you get
500,000 = 1.05 * 500000 - d
this gives 500000 = 525000 - d
so d = 25000


Thanks
One more question
Can you also look question 9
Part d
We have to find area of triangle
I draw sketch and I used part c value as a base and 2 as a s height
But they find BC and use this as height.....can u plz explain me this


If you draw sketch by points given
A -1,-2
B7,2
C 6,4
You will realize what I mean
(edited 6 years ago)
Original post by JezDayy
No same lol, let's hope k doesn't equal 41/8 or R = 44/3 lmao :colondollar:


Trust :colonhash: just give me nice easy questions. I haven't done that much prep at all :colondollar: but I'm relying on a2 maths you feel. Got a resit tomorrow and then it'll be my focus :redface:
Reply 134
Avatar for candol
candol
7
Original post by Qer
Thanks
One more question
Can you also look question 9
Part d
We have to find area of triangle
I draw sketch and I used part c value as a base and 2 as a s height
But they find BC and use this as height.....can u plz explain me this


If you draw sketch by points given
A -1,-2
B7,2
C 6,4
You will realize what I mean


A pleasure. these questions often lead through. Part c as a base is correct. We know angle ABC is a right angle (told in question) so we need the length of BC (using pythagoras) to then do 1/2 ab x bc
does that help?.
Reply 135
Avatar for Qer
Qer
16
http://www.physicsandmathstutor.com/a-level-maths-papers/c1-edexcel-practice/
Can anyone look paper 4 here
There is question 6
I don't understand its last part please help me
Original post by Qer
http://www.physicsandmathstutor.com/a-level-maths-papers/c1-edexcel-practice/
Can anyone look paper 4 here
There is question 6
I don't understand its last part please help me

Is it the one that says, "Find the Coordinates of D"?

If so, as it's a regular rectangle to get from Point B to Point C you move up 8 and across 6.

So from Point A to D (as it has the same gradient as BC). Point A is (3,0) therefore 3+8 = 11 and 0+6 = 6, so coordinates of D is (11,6)
(edited 6 years ago)
Original post by Qer
http://www.physicsandmathstutor.com/a-level-maths-papers/c1-edexcel-practice/
Can anyone look paper 4 here
There is question 6
I don't understand its last part please help me


In short. Once you've found the co-ordinates of the point C, you'll be able to find the gradient of AD.

Then you can just setup an equation to figure out

11 - X = -1
8 - X = 2
Reply 138
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Qer
16
Original post by BenSainsbury
Is it the one that says, "Find the Coordinates of D"?

If so, as it's a regular rectangle to get from Point B to Point C you move up 8 and across 6.

So from Point A to D (as it has the same gradient as BC). Point A is (3,0) therefore 3+8 = 11 and 0+6 = 6, so coordinates of D is (11,6)


yeah it is
i thought that it would be 7,6
but it is 11,6
Original post by Qer
yeah it is
i thought that it would be 7,6
but it is 11,6



P.s. I had my coordinates wrong their.

K has coordinates (8,10) and the gradient of AD is -1/2

y2-y1
===== --> M
x2 - x1

So

10 - X = -1
8 - X = 2

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